The total number of ways of drawing 4 cards from a pack of 52 cards is ‌52C4 ways. Let E be the event of drawing one card from each suit. There are 4 different suits of 13 cards each in the pack of 52 cards. So, 4 cards each of a different suit can be chosen in ‌13C1×‌13C1×‌13C1×‌13C1) ways. ∴P(E)=