Answers

2016-03-21T20:32:40+05:30
15Cr/11=15Cr-1/5
15Cr/15Cr-1=11/5
15-r+1/r=11/5 [ nCr/nCr-1=n-r+1/r]
80=11r+5r

r=5

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1 5 1
2016-03-21T20:35:16+05:30
15Cr/11=15Cr-1/515Cr/15Cr-1=11/515-r+1/r=11/5 [ nCr/nCr-1=n-r+1/r]80=11r+5rr=5
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