If , then find the value of…

MATHEMATICS · Subjective · AP · AP Precalculus · Polynomial and Rational Functions · Polynomial and Rational Functions

Problem

If (1+x−2x2)20=∑r=080arxr(1 + x - 2x^2)^{20} = \sum_{r=0}^{80} a_r x^r , then find the value of a1+a3+a5+⋯+a39a_1 + a_3 + a_5 + \dots + a_{39} .

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