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Find the coefficient of x^8 in the expansion of (x+2)^11.(a) 640(b) 326(c) 1320(d) 456I had been asked this question in my homework.I would like to ask this question from Counting in portion Counting of Discrete Mathematics

Answer»

Correct ANSWER is (c) 1320

Best EXPLANATION: The coefficient of the 8^th TERM is ^11C8 = 165. HENCE, the 8^th term of the expansion is 165 * 2^3 * x^8 = 1320x^8, where the coefficient is 1320.



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