Mathematics
WAEC 1997
The eleventh term of an AP, is 25 and its first term is -3. Find its common difference.
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A.
19/10
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B.
21/5
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C.
23/11
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D.
21/2
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E.
24/5
Correct Answer: Option E
Explanation
a + 10d = 25
-3 + 10d = 25
d = 28/10 = 24/5
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