book Maths Puzzle Numerical Ability

{-2 < x < 9}

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book Other Question

log2 16 = 8.2 (exp -x), then x=


a) -7 b) -4/3 c) -1 d) -2/3 e) 1

exponent is -x in the 8.2 problem
Can you explain how to substitute cot (angle) with 1/root3