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Q.

$15 {mm}^{2} =_____{cm}^{2}$

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a

$15 \times 10^{- 3}$

b

$15 \times 10^{- 2}$

c

$15 \times 10^{- 1}$

d

$15 \times 10^{- 4}$

answer is A.

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Detailed Solution

$15 {mm}^{2} = 15 \times {(10^{- 1})}^{2} {cm}^{2}$ $1 mm = 10^{- 1} cm$

$\Rightarrow 15 \times 10^{- 2} {cm}^{2}$

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