how many 4 letters can be formed from A,B,C,D E and F if repetion is not allowed?
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how many 4 letters can be formed from A,B,C,D E and F if repetion is not allowed?
how many 4 letters can be formed from A,B,C,D E and F if repetion is not allowed?
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The first letter must be B, C, D or F.
The second letter can be 1 of 5 left, third - one of 4 left and fourth - one of
3 left.
So, N=5*4*3*4=240.
Ans. a. 240.