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Question

The number of non negative integers which are less than 1000 and end with only one zero is

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Solution

0 itself is a non negative integer(single digit).

9×1 = 9 integers which end in exactly one 0(2 digit numbers).

9×9×1 = 81 integers which end in exactly one zero (3 digit).

Thus, 91 numbers are there which satisfy this condition.


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