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[" If the number of terms in the expansi...

[" If the number of terms in the expansion of "],[(1-(2)/(x)+(4)/(x^(2)))^(n),x!=0," is "28" ,then the sum of the "],[" coefficients of all the terms in this expansion,is "],[[" (a) "64," (b) "2187," (c) "243," (4) "729]]

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