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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