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      Question

      Find the remainder when 215 is divided by

      7.
      B 4 Correct Answer Incorrect Answer
      C 2 Correct Answer Incorrect Answer
      D 1 Correct Answer Incorrect Answer

      Solution

      ATQ, Calculate powers of 2 mod 7: 21 = 2 (mod 7) 22 = 4 (mod 7) 23 = 8 ≑ 1 (mod 7) So pattern repeats every 3 powers: 2, 4, 1, 2, 4, 1, ... 15 Γ· 3 = 5, remainder 0 So 215 will give the same remainder as 23 (end of a full cycle), which is 1.

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