The way to get the length of RS is actually very simple. You see how there is a number 17 in the line? You take that and it should mean every area where a line should be is 17. So, R is 17, the 2nd line is 17, M is 17, the 4th line is 17, and S is 17. So you then multiply 17 times 5 and get 85.
Each time multiplied by 6/5 the common ratio is 6/5 since |6/5|>1, the series does not converge to a single number and the sum approaches positive infinity
there is no real number that the sum of this series approaches
