8,780,000,000,000= _______.

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Question

$8, 780, 000, 000, 000 =$ _______.

Options:

A .

8.78 \times 10^{12}

B .

8.78 \times 10^{- 12}

C .

87.8 \times 10^{12}

D .

87.8 \times 10^{- 11}

Answer: Option A
:
A

$8, 780, 000, 000, 000 = 878 \times 10^{10}$
$= 8.78 \times 10^{2} \times 10^{10}$
$= 8.78 \times 10^{12}$
$= 87.8 \times 10^{- 1} \times 10^{12}$
$= 87.8 \times 10^{11}$
(Using $a^{m} \times a^{n} = a^{m + n}$ )

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