passwella.
Menu

JAMB Mathematics 2008 Question 20

Question 20

Progressions

The fifth term of an A.P. is 24 and the eleventh term is 96. Find the first term.

  1. A.12
  2. B.4
  3. C.−12
  4. D.−24
Show the answer and explanation

Answer: D (−24)

Explanation

a + 4d = 24 and a + 10d = 96, so 6d = 72, d = 12 and a = 24 − 48 = −24.