1.

Ib the expansion of \( (3 x+2 y)^{18} \). Find \( 4^{\text {th }} 7^{\text {th }} \) \& th terms?

Answer»

(3x+2y)18

General term in the expansion is

Tr+1 = 18c(3x)8-r (2y)r

∴ 4th term = T4 = 18 c3 (3x)18-3 (2y)3

= 18 c3 315 23 x15 y3

7th term = T7 = 18c6 (3x)12 (2y)6

8th term = T8 = 18c7 (3x)11 (2y)7.



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