Practice Test Discussion

What will come in place of question mark (?) in the following questions

${(98)}^{45} \times {(98)}^{-35} =?$

[OBC (PO), 2008]

${(98)}^{2}$

${(98)}^{- 5}$

${(98)}^{10}$

None of these

Explanation

$\begin{array}{l} Here \\ {= (98)}^{45} \times {(98)}^{-35} \\ By the rule of indices, we get \\ {= 98}^{45-35} {= (98)}^{10} \end{array}$

Hence, Option D is correct.

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