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Question
Count the numbers between 999 and 10000 subject to the condition that there are no restriction
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Solution
No restriction
We have to find 4 digit numbers
The 1000’s place can be filled in 9 ways .....(excluding zero) and the 100’s, 10’s and unit places respectively can be filled in 10, 10, 10 ways .....(including zero)
So the number of numbers between 999 and 10000
= 9 × 10 × 10 × 10
= 9000
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