JAMB Mathematics 2010 Objective — Question 22

Question 22 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2010 Objective paper, with the correct answer and a full explanation.

22. The 3rd term of an arithmetic progression is -9 and 7th term is -29. Find the 10th term of the progression. A. 165 B. 44 C. -44 D. -165

A. 165
B. 44
C. -44Correct
D. -165

Explanation

a+2d=-9(i); a+6d=-29(ii). Subtracting: -4d=20, d=-5. a=-9-2(-5)=1. T10=a+9d=1+9(-5)=-44.

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