exam Maths Puzzle Numerical Ability

Let n denote an integer greater than 1. Which of the following statements are true?
i. if 2^n -1 is prime, then n is prime
ii. if n is prime, then 2^n - 1 is prime
iii. if 2^n -

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exam Other Question
Find the solution(s) for when f(x) = -4 if f(x) = x^2 – x and f(x) = 12.
a. x = {4}
b. x = {-3, 4}
c. x = {-4, 3}
d. No solution Can u please help me solve this equation:

[2x-5 4y+3z] -7 31
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