the number of permutations of n different things taking r at a time when 3 particular things are to be included is a)p(n-3,r-3) b)p(n-3,r) c)p(n,r-3) d)r!C(n-3,r-3)

Asked by devashree | 7th Jan, 2014, 03:18: PM

Expert Answer:

Answered by Vimala Ramamurthy | 9th Jan, 2014, 10:52: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.