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[" If "^(n)C(r-1)=36,^(n)C(1)=84,^(n)C(1...

[" If "^(n)C_(r-1)=36,^(n)C_(1)=84,^(n)C_(1+1)=126," then "r" is equal to "],[[" (a) "0," (b) "1," (c) "2,]]

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