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Question
How many numbers are there between 100 and 500 with the digits 0, 1, 2, 3, 4, 5? if the repetition of digits is not allowed
Solution
The 100’s place can be filled (by using 1, 2, 3, 4) 10’s in 4 ways
The 10’s place can be filled in (6 – 1)5 ways
And the unit place can be filled in (5 – 1)4 ways
So the number of 3 digit number 4 × 5 × 4 = 80
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