Last Updated: June 10, 2026
Effective Date: June 10, 2026
1. Agreement to Terms
These Terms of Service ("Terms") constitute a legally binding agreement between you ("User" or "you") and Mathematical Calculator Tools ("we," "our," or "us") regarding your use of our website located at combination-sum-calculator.com and all related services, features, and content (collectively, the "Service").
By accessing or using our Service, you agree to be bound by these Terms and our Privacy Policy. If you do not agree to these Terms, you may not access or use the Service.
2. Description of Service
2.1 Our Service
Mathematical Calculator Tools provides free online mathematical calculators and educational resources, specializing in:
- Combination sum calculations and analysis
- Basic combination (nCr) and permutation (nPr) calculations
- Subset sum problem solving
- Multiset combination calculations
- Educational content and mathematical explanations
- Related mathematical tools and utilities
2.2 Service Availability
We strive to maintain high availability of our Service, but we do not guarantee uninterrupted access. The Service may be temporarily unavailable due to maintenance, updates, or technical issues.
3. Acceptable Use
3.1 Permitted Uses
You may use our Service for legitimate purposes, including:
- Educational research and learning
- Academic assignments and homework (as a verification tool)
- Professional mathematical calculations
- Personal mathematical exploration and understanding
- Non-commercial research and development
3.2 Prohibited Uses
You agree NOT to use our Service for:
- Any illegal, harmful, or unethical activities
- Attempting to reverse engineer, copy, or replicate our algorithms
- Creating competing services or applications
- Automated scraping or data harvesting
- Overloading our servers with excessive requests
- Distributing malware, viruses, or harmful code
- Violating any applicable laws or regulations
- Infringing on intellectual property rights
4. User Responsibilities
4.1 Accurate Information
When contacting us or providing information, you agree to provide accurate, current, and complete information. You are responsible for maintaining the accuracy of any information you provide.
4.2 Compliance
You agree to comply with all applicable laws, regulations, and these Terms when using our Service. You are solely responsible for your conduct and any consequences thereof.
4.3 Result Verification
Important: While we strive for accuracy, you are responsible for verifying calculation results before using them for critical decisions. Our calculators are provided as educational and computational aids, not as professional advice.
5. Intellectual Property Rights
5.1 Our Rights
The Service and all content, features, and functionality are owned by Mathematical Calculator Tools and are protected by copyright, trademark, and other intellectual property laws. This includes:
- Website design, layout, and user interface
- Proprietary algorithms and calculation methods
- Educational content, explanations, and examples
- Trademarks, service marks, and logos
- Software code and technical implementation
5.2 Your Rights
Subject to these Terms, we grant you a limited, non-exclusive, non-transferable license to access and use the Service for your personal or internal business purposes.
5.3 Mathematical Formulas
Mathematical formulas and principles themselves are not subject to copyright. However, our specific implementations, explanations, and educational presentations are protected intellectual property.
6. Disclaimers and Warranties
6.1 Service Provided "As Is"
THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS. WE MAKE NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION:
- Warranties of merchantability or fitness for a particular purpose
- Warranties of accuracy, completeness, or reliability of calculations
- Warranties of uninterrupted or error-free operation
- Warranties that the Service will meet your specific requirements
6.2 Educational Purpose
Our calculators are designed for educational and computational purposes. While we strive for accuracy, mathematical calculations should be verified independently before use in critical applications.
6.3 No Professional Advice
The Service does not provide professional mathematical, financial, academic, or any other professional advice. Results should not be relied upon for critical decisions without independent verification.
7. Limitation of Liability
TO THE MAXIMUM EXTENT PERMITTED BY LAW, MATHEMATICAL CALCULATOR TOOLS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING WITHOUT LIMITATION:
- Loss of profits, data, or business opportunities
- Damages resulting from calculation errors or inaccuracies
- Damages from service interruptions or downtime
- Any damages arising from use of the Service
Our total liability for any claims related to the Service shall not exceed $50, regardless of the theory of liability.
8. Indemnification
You agree to indemnify, defend, and hold harmless Mathematical Calculator Tools and its officers, directors, employees, and agents from any claims, damages, losses, or expenses (including reasonable attorney fees) arising from:
- Your use or misuse of the Service
- Your violation of these Terms
- Your violation of any applicable laws or third-party rights
- Any content or information you provide
9. Privacy
Your privacy is important to us. Our collection and use of information is governed by our Privacy Policy, which is incorporated into these Terms by reference. By using the Service, you consent to the collection and use of information as described in our Privacy Policy.
10. Modifications to Terms
We reserve the right to modify these Terms at any time. When we make changes, we will:
- Update the "Last Updated" date at the top of these Terms
- Post the revised Terms on our website
- For material changes, provide notice through email or website notifications
Your continued use of the Service after changes constitutes acceptance of the new Terms.
11. Termination
11.1 Termination by You
You may stop using the Service at any time. No formal termination notice is required.
11.2 Termination by Us
We may terminate or suspend your access to the Service at our discretion, including for violations of these Terms or applicable laws.
11.3 Effect of Termination
Upon termination, your right to use the Service ceases immediately. Provisions that by their nature should survive termination will survive, including intellectual property rights, disclaimers, and limitations of liability.
12. Governing Law and Jurisdiction
These Terms are governed by and construed in accordance with the laws of the State of California, United States, without regard to conflict of law principles.
Any legal action or proceeding arising under these Terms will be brought exclusively in the federal or state courts located in San Francisco County, California, and the parties consent to the jurisdiction of such courts.
13. Severability
If any provision of these Terms is found to be unenforceable or invalid, that provision will be limited or eliminated to the minimum extent necessary so that the remaining Terms will remain in full force and effect.
14. Entire Agreement
These Terms, together with our Privacy Policy, constitute the entire agreement between you and Mathematical Calculator Tools regarding the Service and supersede all prior agreements and understandings, whether written or oral.
15. Contact Information
If you have any questions about these Terms, please contact us:
Contact Information
Email: [email protected]
Acknowledgment and Acceptance
BY USING OUR SERVICE, YOU ACKNOWLEDGE THAT YOU HAVE READ, UNDERSTOOD, AND AGREE TO BE BOUND BY THESE TERMS OF SERVICE.
If you do not agree to these Terms, you must not access or use the Service. Your use of the Service constitutes your acceptance of these Terms as they may be amended from time to time.