Practice Test Discussion

${(27)}^{18} \div {(27)}^{3}$

[AndhraBank (PO), 2008]

${(27)}^{54}$

${(27)}^{21}$

${(27)}^{15}$

${(27)}^{6}$

None of these

Explanation

$\begin{array}{l} Here, \\ \Rightarrow {(27)}^{18} {+ (27)}^{3} [∵ a^{m} \div a^{n} = a^{m - n}] \\ \Rightarrow {(27)}^{18-3} {=(27)}^{15} \end{array}$

Hence, Option C is correct.

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