Teaching HSSC TGT 2023 Mock Test (Latest Pattern) Mathematics Binomial Theorem Binomial Expansion

If (1 - x + x2)n = a0 + a1x + a2x2 + ... + a2nx2n, then a0 + a2 + a4 + ... a2n is?

1
\(\frac {3^n + 1}2\)
2
\(\frac {3^n - 1}2\)
3
\(\frac {1 - 3^n}2\)
4
\(3^n + \frac 1 2\)
5
Not Attempted
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