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[" 74.If the binomial expansion of "(a+b...

[" 74.If the binomial expansion of "(a+bx)^(-2)" is "(1)/(4)-3x+..." ,then "],[[(a,b)=," (b) "(2,8)],[" (a) "(2,12)," (d) none of these "],[" (c) "(-2,-12)," (i) "(-1)=]]

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