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Question

Write in scientific notation: $(400000)^{4}$
$6.4 \times 10^{20}$
$2.56 \times 10^{20}$
$2.56 \times 10^{22}$
$6.4 \times 10^{19}$

A

6.4 \times 10^{20}

B

6.4 \times 10^{19}

C

2.56 \times 10^{20}

D

2.56 \times 10^{22}

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Solution

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The correct option is C $2.56 \times 10^{22}$
$(400000)^{4} = 4^{4} \times 10^{20}$
$\Rightarrow (400000)^{4} = 256 \times 10^{20} = 2.56 \times 10^{22}$
Ans-Option $C$ .

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