What is the co eff of middle term (1+x)^40
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Step-by-step explanation:
number of terms in(1+x)^40 = 40+1= 41
middle term = (41+1)/2 = 21St term
=> 21st term of (1+x)^40
= 40×39×38×37×......×21 x^20 / 20 !
therefore coefficient of middle term
= 40×39×38×37×36×...........×21 / 20 !
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