Question

the smallest and greatest nine digit numer

Answer 1

here is your answer mate

The smallest 9 digit no is 100000000 & greatest 8 digit no is 99999999 so now you can easily get the Ans by subtraction. Assuming positive numbers, The smallest 9 digit number is 100,000,000 and the largest 8 digit number is 99,999,999.

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Answer 2

smallest-100000000,greatest-999999999