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If (1+x−2x2)20=a0+a1x+a2x2+⋯+a40x40 and the value of a1+a3+a5+⋯+a39=−2k, then k=

Answer» If (1+x2x2)20=a0+a1x+a2x2++a40x40 and the value of a1+a3+a5++a39=2k, then k=


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