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The coefficient of x^-17 in the expansion of (x^4 - 1/x^3)^15 is : A. 1365  B. -1365  C. 3003  D. -3003

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The coefficient of x-17 in the expansion of (x4 - 1/x3)15 is :

A. 1365 

B. -1365 

C. 3003 

D. -3003

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1 Answer

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Best answer

Option : (B)

Given :

(x4 - 1/x3)15

60-4k-3k = -17 

-7k = -77 

k = 11

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