Eight different letters of an alphabet are given.
Words of four letters from these are formed.
The number of such words with atleast one letter repeated is:
(a) \binom{8}{4}-^8P_4
(b) 8^4+\binom{8}{4}
(c) 8^4-^8P_4
(d) 8^4-\binom{8}{4}
Words of four letters from these are formed.
The number of such words with atleast one letter repeated is:
(a) \binom{8}{4}-^8P_4
(b) 8^4+\binom{8}{4}
(c) 8^4-^8P_4
(d) 8^4-\binom{8}{4}
