Post-UTME Mathematics 2013 Objective — Question 17
Question 17 of 100 from the Post-UTME Screening (Post-UTME) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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The 4th term of an A.P is 13 while the 10th term is 31. Find the 21st term.
- A. 175
- B. 85
- C. 64Correct
- D. 45
Explanation
a+3d=13, a+9d=31 gives d=3, a=4. 21st term=a+20d=4+60=64.
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