Question

when we have to multiply some number with 9, 99, 999, 9999 simply subtract 1 from the digit to be multiplied by 9, 99, 999, 9999 and then the result should be subtracted from 9, 99, 999, 9999 and the result is your answer tell me in answer if it helps you in calculating the true answer​

Answer 1

Answer:

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