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The value of

Question:

The value of (2/5)-2 is:

(a) 4/5

(b) 4/25

(c) 25/4

(d) 5/2

Solution:

(c) 25/4

Explanation: By the law of exponent we know: a-n = 1/an.

Hence, (2/5)-2 = 1/(2/5)2 = 1/(4/25) = 25/4

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