The event "10" from a full desk of standard playing cards consists of how many elementry events?

Answer 1

if it is the number 10 only, the answer is 4 events, the 10 in each suit.

if it is like Blackjack where K,Q,J & 10 all equal 10 the answer is 4 cards in 4 different suits or 16 events.

Answer 2

King (from each of the four suits)
Queen
Jack
Ten

4 different cards cause the event "10".
If suits are considered, 16 of the 52 cards in a standard deck create "10".