1.

If (1+x+x2)n=a0+a1x+a2x2+...+a2nx2n, and E1=a0+a3+a6+..., E2=a1+a4+a7+..., E3=a2+a5+a8+..., then

Answer»

If (1+x+x2)n=a0+a1x+a2x2+...+a2nx2n, and E1=a0+a3+a6+...,
E2=a1+a4+a7+...,
E3=a2+a5+a8+..., then



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