First card can be any thing but second has to be of the same suite.
Probability (A gets cards of same suite ) =13/52 = 1/4
Outcomes of dish totaling 6 are = { (1,5), (2,4), (3,3), (4,2), (5,1)}
Probability = 5/36
Both events are independent so the probability of both events happening = 1/4 x 5/36 = 5/144