Permutation and CombinationHard
Question
Let Pn denotes the number of ways in which three people can be selected out of ′n′ people sitting in a row, if no two of them are consecutive. If Pn+1 - Pn = 15 then the value of ′n′ is -
Options
A.7
B.8
C.9
D.10
More Permutation and Combination Questions
Number of positive integral solutions of x1 . x2 . x3 = 30, is...In how many ways 7 different beads be strung into a ring so that two particular beads are always together?...Find the number of ways to distribute 8 identical balls among 3 distinct boxes such that none of the boxes remains empty...The number of ways in which 4 boys & 4 girls can stand in a circle so that each boy and each girl is one after the other...The number of ways in which 15 identical apples & 10 identical oranges can be distributed among three persons, each rece...