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Question

Find the value of 'n' if (9)18(9)n=911

A
9
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B
6
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C
7
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D
5
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Solution

The correct option is C 7
By the Laws of Exponents, we know that aman=amn
Given (9)18(9)n=911
918n=911, since the bases are same so equating the exponents
18n=11n=1811=7

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