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0 votes
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in Binomial Theorem by (27.0k points)
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In the expansion of (x2 - 1/3x)9, the term without x is equal to :

A. 28/81

B. -28/243

C. 28/243

D. None of these

1 Answer

+1 vote
by (24.8k points)
selected by
 
Best answer

Option : (C)

Given :

(x2 - 1/3x)9

⇒ x2(9 – k)-k = x0 

⇒ 18-2k-k = 0 

⇒ 18-3k = 0 

⇒ k = 6

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