Write the coefficient of the middle term in the expansion of (1 + x)2n.
To find: that the middle term in the expansion of 
is 252.
Formula Used:
A general term, Tr+1 of binomial expansion
is given by,
Tr+1
nCr xn-r yr where
nCr
Total number of terms in the expansion is 11
Thus, the middle term of the expansion is T6 and is given by,
T6
10C5
T6
10C5
T6
T6=252
Thus, the middle term in the expansion of 
is 252.
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