Hi and welcome
Becky is right but patterns are not always clear if I wrote a pattern that needed 24 rows of rib I would write Row 1 K2, P2 to end, Row 2 P2,K2 to end repeat from * to * 11 times. Your pattern starts with an even number of stitches not divisible by 4 eg 82, 102.
Becky also hit on a good point, a lot of patterns say something like work in pattern until work is a certain length and rib is easier to do than cable if you want to save some time.
Good luck and always think high