Mathematics
JAMB 2012
The nth term of a sequence is n
2 - 6n - 4. Find the sum of the 3rd and 4th terms.
-
A.
24
-
B.
23
-
C.
-24
-
D.
-25
Correct Answer: Option D
Explanation
n
2 - 6n - 4
For the 3rd term,
3
2 - 6(3) - 4
9 - 18 -4 = -13
For the 4th term,
4
2 - 6(4) - 4
16 - 24 - 4 = -12
Sum of both terms
-13 - 12 = -25
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