book Maths Puzzle Numerical Ability

If 4^(1/5) = x, then

a. x * x * x * x * x = 4
b. 1/(x * x * x * x * x) = 4
c. 4 * 4 * 4 * 4 * 4 = x
d. 1/(4 * 4 * 4 * 4 * 4) = x

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