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Comparing Numbers

If m=7777 ....

Question

If $m = 7777 . . . . . . . 7777$ is a $99$ digit number and $n = 999 . . . . . . . . 999$ is $77$ digit number then the sum of the digits in the product $m \times n$ is .........

890

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891

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892

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893

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Solution

The correct option is B $891$

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{9, 99, 999, 999999999}

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