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[" 5.If the coefficients of "x^(2)" and "x^(3)" are both "x" .If "r=2],[" in the expansion of the express "],[[(1+ax+bx^(2))(1-3x)^(15)" in powers of "x,1,rArr],[" the ordered pair "(a,b)" is equal to "," value "],[" UEE Main "2019,10" Aprilst ",rArr]]

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