Q nCr-1=56, nCr=28 and nCr+1=8, then r is equal to
A}8
B}6
C}5
D}none
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Permutation problem
Replies (2)
See Manish , divide nCr-1 and nCr ( i.e. nCr-1/nCr =56/28).. So after solving we get the foll. Eqn. 3r=2n+2 .... Ab aise hi divide nCr/nCr+1 = 28 /8 ... So we get another eqn. That is 9r= 7n-2..
Now solving these two equations we will get r=6..
Q A comminity of 3 ladies and 4 gents is to be formed out of 8 ladies and 7 gents. Mrs X refuses to serve in a committee in which Mr Y is the member. the number of such committes is
A}1530
B}1500
C}1520
D}1540
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