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  4. If (1/5Cr)+(1/6Cr) =(1/4Cr), then the value of r equals to

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Q. If $\frac{1}{^{5}C_{r}}+\frac{1}{^{6}C_{r}} =\frac{1}{^{4}C_{r}}$, then the value of $r$ equals to

WBJEEWBJEE 2016Permutations and Combinations

Solution:

Correct answer is (b) $2$