passpadi

2016

Mathematics

JAMB

If the 2nd term of a G.P is 8/9 and the 6th term is 4(1/2) . Find the common ratio.

A.

2

B.

3/2

C.

2/3

D.

3

Correct Answer: 3/2

Explanation

T26 = 4(1/2) ar = 8/9 ar5 = 9/2 ar/ar5 = 8/9 x 2/9 1/r4 = 16/81 r = 4√(18/16) = 3/2

T26 = 4(1/2) ar = 8/9 ar5 = 9/2 ar/ar5 = 8/9 x 2/9 1/r4 = 16/81 r = 4√(18/16) = 3/2
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