41^{43}+43^{43} is divisible by
- A. 80
- B. 84 ✓
- C. 86
- D. 88
Correct Answer: B. 84
Explanation
For any odd positive integer n, the expression a^n + b^n is completely divisible by (a+b). Here, n=43 is odd, so 41^{43} + 43^{43} is divisible by 41 + 43 = 84.
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