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If the coefficient of x^r (0<=r<=n-1) in...

If the coefficient of `x^r (0<=r<=n-1)` in expression `(x+2)^(n-1)+ (x+2)^(n-2) (x+ 1) +(x+1)^(n-1)` is `b(n,r)` then `(b(10,7))/10` is equal to

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