\text { The value of }(2 / 5)^{-2} \text {is: }
(a) 4/5 (b) 4/25 (c) 25/4 (d) 5/2
(c) 25/4
Explanation: By the law of exponent we know:
\mathrm{a}^{-\mathrm{n}}=1 / \mathrm{a}^{\mathrm{n}}
\text { Hence, }(2 / 5)^{-2}=1 /(2 / 5)^{2}=1 /(4 / 25)=25 / 4
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