If (1-x+x^ 2 )^ 7 =a_ n +a_ 1 x+ +a_ 2 n x^ 2 n then the value of a_ n +a_ 2 +a_ 4 + +a_…
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
If \(\left(1-x+x^{2}\right)^{7}=a_{n}+a_{1} x+\ldots+a_{2 n} x^{2 n}\) then the value of \(a_{n}+a_{2}+a_{4}+\ldots+a_{2 n} i 5\)
- \(3^{n}+\frac{1}{2}\)
- \(3^{n}-\frac{1}{2}\)
- \(\frac{3^{n}-1}{2}\)
- \(\frac{3^{n}+1}{2}\)
Answer
(D) 3^ n +1 2
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