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[" If "sum(r=0)^(n)((r+2)/(r+1))^(n)C(r)...

[" If "sum_(r=0)^(n)((r+2)/(r+1))^(n)C_(r)=(2^(8)-1)/(6)," then "n" is "],[[" (1) "8," (2) "4," (3) "6," (4) "5]]

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If sum_(r=0)^(10)((r+2)/(r+1))*^(n)C_(r)=(2^(8)-1)/(6), then n is (A) 8(B)4(C)6(D)5

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sum_(r=0)^(n)((r+2)/(r+1))*""^(n)C_(r) is equal to :

sum_(r=0)^(n)((r+2)/(r+1))*""^(n)C_(r) is equal to :

sum_(r=0)^(n)((r+2)/(r+1))*""^(n)C_(r) is equal to :