The number of 3 digit numbers greater than 300 that can be formed with the digits 1 2 3 4 5 an...........

Quantitative Aptitude ( CCS) Permutation & Combination

The number of 3 digit numbers greater than 300, that can be formed with the digits, 1, 2, 3, 4, 5, and 6 such that no digit is repeated in any single 3 digit number is ?

120

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Explanation:

We have 3 places to fill.
____ ____ ____

1st can be filled by (3,4,5,6) => 4 ways.
2nd can be filled in 5 ways since 1 element is filled in the 1st position.
3rd can be filled in 4 ways.
So 4 × 5 × 4 = 80 ways.
Hence 80 numbers can be formed.