Find the greatest no. That divides 85 and 72 leaving remainders 1 and ...
Explanation:
The greatest number that divides 85 and 72 leaving remainders 1 and 2 respectively can be found using the concept of the highest common factor (HCF) or greatest common divisor (GCD).
Finding the GCD using Remainder Theorem:
- Let x be the greatest number that divides both 85 and 72 leaving remainders 1 and 2 respectively.
- According to the Remainder Theorem, if a number divides two numbers leaving remainders r1 and r2 respectively, it must also divide their difference.
- Therefore, x must divide (85 - 1) = 84 and (72 - 2) = 70.
Calculating the GCD of 84 and 70:
- The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84.
- The factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70.
- The common factors of 84 and 70 are 1, 2, and 7.
- Therefore, the greatest common factor (GCF) of 84 and 70 is 7.
Conclusion:
- The greatest number that divides 85 and 72 leaving remainders 1 and 2 respectively is 7.
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