College Mathematics
posted by slomomo .
Probability: "or" and "and" problem.
Select one card, one card is selected from a deck of playing cards. Determine the probability of selecting a jack or a club.

if 1st card is JC, p=1/52
If 1st card is J~C, then C, p = 3/52*13/51
If 1st card is C~J, then J, p=12/52 * 4/51
So, p(any) = 1/52 + 3/52 * 13/51 + 12/52 * 4/51 = 23/442 = 0.052