2015
Mathematics
JAMB
Determine the third term of a geometrical progression whose first and second term are 2 and 54 respectively
A.
1458
B.
1485
C.
1345
D.
1258
Correct Answer: 1458
Explanation
1st G.P. = a =2 2nd G.P. = ar2-1 = 54 2(r) = 54 r = 54/2 = 27 r = 27 3rd term = ar2 = (2) (27)2 2 × 27 × 27 = 1458
1st G.P. = a =2 2nd G.P. = ar2-1 = 54 2(r) = 54 r = 54/2 = 27 r = 27 3rd term = ar2 = (2) (27)2 2 × 27 × 27 = 1458THIS WEEK's
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