Question

In -5p^2 q^3 r^4, the coefficient of -5pq^2r=?​

Answer 1

Answer:

In the expansion of (1+x) 18

coefficient of T2r+4 =  18 C  2r+3

coefficient of Tr−2 =  18 Cr−3

Given,

18 C2r+3 =  18 Cr−3

⇒2r−3=r+3 or 2r+3+r−3=18

⇒r=−6              or         3r=18⇒r=6

but r cannot be negative  

∴r=6

Explanation:

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