Hey iv been stuck on this question for a while now and am convinced its just because im missing something obvious so was wondering if anyone can give me some help.

What proportion of 6-element subsets of {1, 2, . . . , 49} contain at least two consecutive integers? What proportion of 7-element subsets of {1, 2, . . . , 49} contain at least two con-secutive integers?

thanks