1.

The coefficient of t4 in the expansion of  ((1 - t6)/(1 - t))3 is:(1) 14(2) 15(3) 12(4) 10

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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