Question

How many 3 digit numbers greater than 400 can be made with digits 2,3,4,0,5,6?

Answer 1

3 digit number greater than 400 can be made with digit 2,3,4,0,5,6
3 digit number greater than 400= 6p3-5p2
= 6×5×4-5×4×3
=120-60
=60

another method
3 digit number greater than 400
so 4 has fix place
remaining digit 2,3,0,5,6
3 digit number greater than 400= 5p2
=5×4×3=60

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