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SEAMO 2017 — Paper D — Grade 7–8 Question 2

SEAMO · SEAMO 2017 — Paper D — Grade 7–8

Question 2

Find all positive values of $n$ for which $2^n-1$ is divisible by seven.
  1. n is a multiple of two.
  2. n is a multiple of three.
  3. n is a multiple of four.
  4. n is a multiple of five.
  5. None of the above