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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.
  • A. 19/10
  • B. 21/5
  • C. 23/11
  • D. 21/2
  • E. 24/5
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Correct Answer: Option E
Explanation
a + 10d = 25
-3 + 10d = 25
d = 28/10 = 24/5
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