41^{43}+43^{43} is divisible by

  1. A. 80
  2. B. 84
  3. C. 86
  4. 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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