SOLUTION: If 7, M, N and 189 are in G.P ( Geometric Progression). Find the values of M and N

Algebra ->  Sequences-and-series -> SOLUTION: If 7, M, N and 189 are in G.P ( Geometric Progression). Find the values of M and N      Log On


   

Question 816664: If 7, M, N and 189 are in G.P ( Geometric Progression). Find the values of M and N
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

If 7, M, N and 189 are in G.P ( Geometric Progression). 

Find the values of M and N

a%5Bn%5D+=+a%5B1%5D%2Ar%5E%28n-1%29

a%5B4%5D+=+7%2Ar%5E%283%29+=+189   r = 3

 7, 21, 63, 189      M = 21  and N = 63