## For how many whole numbers between 0 and 1000 does the sum of the digits equal 9 ?

Answer Let your whole number be ‘X’. Now, 0 < X < 1000 means that your numbers are either 3 digit, 2 digit and 1 digit. We consider each case seperately. Case 1. ( 1 digit ) I believe its obvious that only ‘9’ fits the criteria. Case 2 ( 2 digit number )...

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