The reciprocal of

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Question:
The reciprocal of (2/5)-1 is:

(a) 2/5

(b) 5/2

(c) –5/2

(d) –2/5

Solution:

(b) 5/2

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

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