Question

Find the number of 5 digits numbers that can be formed with the digits 3,5,6,8,9,2 with repetition not allowed .

Answer 1

No. of ways of selecting 5 digits from the given 6 digits = ${}^6{C}_5$

No. of ways of arranging them = $5!$

So Total number of 5 digits that can be formed = ${}^6{C}_5$$\times$$5!$=720