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Q.

In the expansion x2-3x28 , the middle term is

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a

850532x

b

850532x2

c

850532x3

d

850532x4

answer is B.

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Detailed Solution

n = 8(even) Middle term =n2+1=82+1=5T5=T4+1=10c4x210-4-3x24=10C4x2634x8=210·x626×34x8=210×8164·1x2=850532x2
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