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. 24/5
Correct Answer: D. 24/5
Explanation
a + 10d = 25
-3 + 10d = 25
d = 28/10 = 24/5
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