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Question

Find the sum of all the digits of the result of the subtraction 109999.

Solution
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1099 has ninety nine 0 and one 1
On subtracting 99 , we'll get a number with ninety seven 9 and ending with 01
109999=99...9997 times01
Sum of all digits of this number =(97×9)+(1×0)+(1×1)=874

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