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

[" If "^(n)C_(r-1)=36,quad ^(n)C_(r)=84" and "^(n)C_(r+1)=126," then find "^(r)C_(2)],[" A polygon has "44" diagonals.Find the number "]

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If .^(n)C_(r-1) = 36, .^(n)C_(r) = 84 and .^(n)C_(r+1) = 126

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