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Mathematics
JAMB
The nth term of the sequence 3, 9, 27, 81.....is
A.
3 x 3n-2
B.
3 x 3n-1
C.
3 x 3n+2
D.
3 x 3n+1
Correct Answer:
3 x 3n-1
Explanation
3,9,27,81,..... r = 9/8 = 3 T
n
= ar
n-1
T
n
= 3(3
n-1
= 3(3
2
)/3
3,9,27,81,..... r = 9/8 = 3 T
n
= ar
n-1
T
n
= 3(3
n-1
= 3(3
2
)/3
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