Q.

Which term in the expansion of (2−3x)19 has algebraically the least coefficient?

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a

10th

b

11th

c

12th

d

13th

answer is C.

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Detailed Solution

For algebraically the least coefficient, we first find the numerically the greatest term for x = 1.Using r≤n+11+abx, we getr≤19+11+23⇒r≤12Therefore T13 and T12 have numerically the greatest coefficients.T12 is algebraically the least as it is followed by negative sign.
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