Q.If $\binom{56}{r+6} = \binom{56}{r+3} + \binom{56}{r}$ , then $r$ equals

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Q.If (56r+6)=(56r+3)+(56r)\binom{56}{r+6} = \binom{56}{r+3} + \binom{56}{r}(r+656​)=(r+356​)+(r56​), then rrr equals