Q. 39 B5.0( 2 Votes )

# Find the two middle terms in the expansion of : For ,

a= x4, and n=11

As n is odd, there are two middle terms i.e.

II. and II. General term tr+1 is given by, I. The first middle term is Therefore, for the 6th middle term, r=5

Therefore, the first middle term is     = - 462. x9

II. The second middle term is Therefore, for the 7th middle term, r=6

Therefore, the second middle term is   ………   = 462. x2

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