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[" 66.If "1+r+r^(2)+....+r^(n)=(1+r)],[(...

[" 66.If "1+r+r^(2)+....+r^(n)=(1+r)],[(1+r^(2))(1+r^(4))(1+r^(8))," then the value "],[" of "n" is- "],[[" (A) "13," (B) "14(C)15," (D) "16]]

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