How many three digits number greater than 500 can be formed with digits 0 7 2 6 4 and 8 Assuming no ...........

Quantitative Aptitude (CDS) Permutation & Combination

How many three digits number greater than 500 can be formed with digits 0, 7, 2, 6, 4, and 8. Assuming no digit being repeated?

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Explanation:

anyone of the three digits 6, 7, 8 will occur at hundreds of places.
hundred’s placed can be filled up by anyone of the three digits 6, 7, and 8 in 3 ways, and the remaining two places can be filled up by the remaining five digits in 5P2 ways.
numbers formed = 3 × 5P2
= 4 × 5! /3!

= 80