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0 votes
20.5k views
in Mathematics by (52.4k points)

Four geometric means are inserted between 5 and 160. Find the 2nd geometric mean. 

(a) 80 

(b) 40 

(c) 10 

(d) 20

1 Answer

+1 vote
by (48.4k points)
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Best answer

Correct option (d) 20

Explanation:

5 × r5 = 160 → r5 = 32 ⇒ r = 2.

Thus, the series would be 5, 10, 20, 40, 80, 160. The second geometric mean between 5 and 160 in this case would be 20. 

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