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The coefficient of x^6 in (2 + 2x)^10 is … (a) 10C6 (b) 2^6 (c) 10C6 2^6 (d) 10C6 2^10

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The coefficient of x6 in (2 + 2x)10 is …

(a) 10C6 

(b) 26 

(c) 10C6 26

(d) 10C6 210

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Best answer

(d) 10C6 210

tr + 1 = 210(nCr) 

To find coefficient of x6 put r = 6 

∴ coefficient of x6 = 210 [10C6]

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