True-or-False:In the permutations of n things,r taken together,the number of permutation in which m particular things occur together is $(n-m)P_{r-m}\times rP_m$ - Clay6.com, a Free resource for your JEE, AIPMT and Board Exam preparation

True-or-False:In the permutations of n things,r taken together,the number of permutation in which m particular things occur together is $(n-m)P_{r-m}\times rP_m$