The scientific notation of $123456789$ is

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$1.23456789 \times 10^{8}$

$1.23456789 \times 10^{- 8}$

$12.3456789 \times 10^{9}$

$1.23456789 \times 10^{- 9}$

answer is A.

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Detailed Solution

Explanation:

In scientific notation:

The number is written in the form a×10^b, where a is a number between 1 and 10, and b is an integer.
For 123456789, move the decimal point 8 places to the left to make it a number between 1 and 10. This gives 1.23456789
Since the decimal point was moved 8 places, b=8

Thus, the correct answer is 1.23456789 × 10⁸.

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