If (1+x+x^{2})^{n}=\\sum_{r=0} ^{2 n} a_{r} x^{r}, then a_{0}+a_{2}+a_{4}+\......=

TS ICET 30 Sep 2020 Shift 1 Paper

Question : 131 of 200

Marks: +1, -0

(1+x+x^{2})^{n}=\∑↙{r=0} ↖{2 n} a_{r} x^{r}

, then

a_{0}+a_{2}+a_{4}+\......=

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