$2^{- 5} \times 2^{- 10}$ =

2^{- 15}

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2^{15}

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2^{- 5}

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2^{5}

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Solution

The correct option is A $2^{- 15}$
If $a$ is a non-zero integer and $m$ and $n$ are any integers,
$a^{m} \times a^{n} = a^{m + n} .$
$∴ 2^{- 5} \times 2^{- 10} = 2^{- 5 - 10} = 2^{- 15}$

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