Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Find the coefficient of x 7 in (1 – 2x + x 3 ) 5 .
Text Solution
Verified by ExpertsThe correct answer is:
20
(20)
Co-efficient of x 7 in (1 – 2x + x 3 ) 5
= 
= r 2 + 3r 3 = 7 & r 1 , r 2 , r 3 ≤ 5
(i) r 2 = 4, r 3 = 1, r 1 = 0
(ii) r 2 = 1, r 3 = 2, r 1 = 2 = 
(2) 4 + 
× (– 2) 1 = 20
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