SarkariPYQ

SSC CGL 2021 PYQ — Question 57

SSC CGL - 20 Aug 2021 - Shift 3 • Quantitative Aptitude • Q57

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What is the coefficient of x in the expansion of (3x - 4)3?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 144

We know that,

(x - a)3 = x3 - a3 - 3ax2 + 3a2x ( where a is the constant)

Coefficient of a = 3a2x

Coefficient of a = 3 × 16 × 3 = 144.