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Question

5 digit number combinations.


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Solution

A five digit number can be filled by ten digits 0,1,2,3,4,5,6,7,8,9,in10ways

Thus, each of the five places can be filled in 10 ways.

10×10×10×10×10=100000ways

Now, we need to exclude the possibility of 0 existing at ten-thousand place

The number of 5-digits numbers that have 0 at ten-thousand place 10×10×10×10=10000ways

Therefore, the numbers of ways to write 5-digits numbers =100000-1000

=9000ways


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