The sum of two geometric mean's inserted between 3 and 81 is
A
24
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
18
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
36
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
30
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is C36 Let the required numbers be G1 and G2, then 3,G1,G2,81 are in G.P. Let the common ratio of the G.P be r, we get 81=3r3 ⇒r3=27⇒r=3