Question

There are 6 candidates for 3 posts. In how many ways can the posts be filled?

• A. 120
• B. 130
• C. 100
• D. 110
• E. None of these

Answer 1

The correct option is A 120

The 1st post can be filled up in 6 ways. The 2nd post can be filled up in 5 way. and the 3rd post can he filled up in 4 ways. $\therefore$ By the principle of association, the 3 posts can be filled up in $6\times 5\times 4=120ways.$