permutation and combination
Asked by | 20th Mar, 2009, 08:09: PM
Expert Answer:
15Pr : 16Pr =3:4
15!/(15-r)! :16!/(16-r)! = 3:4
15!(16-r)!/(15-r)!16! =3/4
(16-r)/16 =3/4
So r = 4
Answered by | 20th Mar, 2009, 08:19: PM
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