The sum of the infinity is 243 , the sum first 5 terms of the geometric is 242 ,dertimine the common ratio and first two terms

Answer 1

a/(1-r) = 243
a(1-r^5)/(1-r) = 242
now divide
1-r^5 = 242/243 = 1 - 1/243 = 1 - (1/3)^5
Now finish it off

Answer 2

what is 242+11?