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[" 18.) If "n in N" and the coefficients...

[" 18.) If "n in N" and the coefficients of "x^(-7)" and "x^(-8)" to the expansion of "],[(2+(1)/(3x))^(n)" are equal then "n=],[[" (a) "56," (b) "15],[" (c) "45," (d) "55]]

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