The eleventh term of an AP, is 25 and its first term is -3. Find…

Mathematics WAEC 1997

The eleventh term of an AP, is 25 and its first term is -3. Find its common difference.

  • 19/10
  • 21/5
  • 23/11
  • 21/2
  • 24/5 checkmark

The correct answer is: E

Explanation

a + 10d = 25
-3 + 10d = 25
d = 28/10 = 24/5
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