Question

The sum of the first 20 terms of a G. Pis 244 times the sum of its first 10 terms. The common
ratio is?

Answer 1

Answer:

Step-by-step explanation: S=a(1-r^n)/1-r

a(1-r^20)/1-r=a(1-r^10)/1-r x 244

1-r^20=(1-r^10)244       (times 1/a on two sides, and times 1-r on two sides)

1-r^20=244-244r^10    

-243= -244r^10+r^20

244r^10-r^20-243=0

then solve this equation.