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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
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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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