The graph shows the chance of at least one success against the number of cycles tried, for three techniques P, Q and R. The chance in a single cycle is different for each. Which statement is correct?

Fig. 1: A graph of the chance of at least one success, in per cent, against the number of cycles tried, from 1 to 5. Three curves with dots, labelled P, Q and R at the right end, all rise with the number of cycles. P is the lowest curve, Q is in the middle and R is the highest. None of them starts at the same point.