Question

Find the different permutation of the letters of the word BANANA.

Answer 1

$3A^s,2N^s,B$ i.e. 6 letters, 3 alike of one type and 2 another type. Number of words taken all at a time is

$\frac{6!}{3!2!}=\frac{6\times 5\times 4}{2}=60$.