how to find middle term in the Binomial expansion of (x+a)^4n

Question : Find middle term in the Binomial expansion of (x+a)^4n Solution : Binomial expansion of \[\left(x+a\right)^{4n},\ n\in N\] contains 4n+1 terms which is an odd number. So the (4n+2)/2 = n +1 will be middle term. Now general term…

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