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

[" 42.If "sum_(r=0)^(n)((r+2)/(r+1))*^(n)C_(r)=(2^(8)-1)/(6)" then the value of "n" equals: "],[[" (a) "4," (b) "5],[" (c) "6," (d) "7]]

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