Question 1196576
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Hi


Geometric progression: {7,x,y,189}
{{{a[1] = 7}}}  and {{{a[4] =189}}}   |given
Need to Know!
{{{a[n] = a[1]*r^(n-1)}}}
 

{{{a[4] = 7*r^(4-1)}}}
7r^3 = 189
or
r^3 = 27
r = 3

x = {{{a[2] = 7*3^(2-1) = 7*3)}}} = 21
y= {{{a[3] = 7*3^(3-1) = 7*3^2}}} = 63

Wish You the Best in your Studies.
 
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