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
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