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Post-UTME Mathematics 2013 Objective — Question 52

Question 52 of 100 from the Post-UTME Screening (Post-UTME) Mathematics 2013 Objective paper, with the correct answer and a full explanation.

If x, 2x+1, 3x-a form an A.P, find a

A. 2
B. -2Correct
C. 1
D. -1

Explanation

Common difference: (2x+1)-x=(3x-a)-(2x+1) → x+1=x-a-1 → a=-2.

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