Question

in [1/3+a2]raised to 12 find the 9 term , [its not an ap question)find by using binomial theorem.
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Answer 1

Step-by-step explanation:

as per binomial theorem r+1 term in (x+y)ⁿ is

ncr x^(n-r) y^r

r=9-1=8

n=12

x=1/3

y=a²

9th term = 12c8 * (1/3)^(12-8) * a²^⁸

=12c4 *1/3^4 *a¹⁶

=495/81 *a¹⁶

=6.11*a¹⁶