Question

4th and 7th term of GP and 1/18 and -1/486 respectively find the GP​

Answer 1

Answer:

Step-by-step explanation:

4th term=1/18

7th term=-1/486

now

ar^3/ar^6=1/18/(-1/486)

r^(-3)=-486/18

r^(-3)=-27

r^(-3)=(-3)^3

1/r^3=-3^3

r^3=-1/3^3

r=-1/3

so

a*(-1/3)^3=1/18

a*(-1/27)=1/18

a=-27/18=-3/2

so

the GP is

-3/2,(-3/2)*(-1/3),(-3/2)*(1/9),(-3/2)*(-1/27)----

=-3/2,1/2,-1/6,1/18-------