2003
Mathematics
JAMB
The sum of the first n terms of an arithmetic progresssion is 252. If the first term is -16 and the last term is 72, find the number of terms in the series
A.
6
B.
7
C.
8
D.
9
Correct Answer: 9
Explanation
Sn =252, a = −16 and l =72 Sn =n/2 (−16 +72 ). 252 = n/2 (−16 + 72). N = 504/56. n=9
Sn =252, a = −16 and l =72 Sn =n/2 (−16 +72 ). 252 = n/2 (−16 + 72). N = 504/56. n=9THIS WEEK's
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