1.

The coefficient of x4 in the expansion of (1 + x–2), where |x|<1(a) –5 (b) –3 (c) 4 (d) 5

Answer»

Answer : (d) 5 

(1 + x) –2 = 1 – 2x + 3x2 – 4x3 + 5x4 

⇒ Coefficient of x4 in the expansion of (1 + x)–2 = 5.



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