TS EAMCET 11-Sep-2020 Shift 2 Solved Paper
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Question : 18 of 160
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If sum of the coefficients of x r ( r = 0 , 1 , 2 , . . . . . . . .2 n ) in the expansion of ( 1 + 3 x − 2 x 2 ) n , is 128, then
r
=
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