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The coefficient of t^4 in the expansion of ((1 - t^6)/(1 - t))^3 is:

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The coefficient of t4 in the expansion of  ((1 - t6)/(1 - t))3 is:

(1) 14

(2) 15

(3) 12

(4) 10

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1 Answer

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Best answer

The correct option (2) 15

Explanation:

(1 – t6)3 (1 – t)–3 : 6C4 = 15

(coeff. of t4 in (1 – t)–3)

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