Question

which is a pair of independent events?
choosing one calendar date for sports practice and then choosing a back - up date
choosing one card from a deck and then choosing one card from another deck
choosing a pen to write with in class and then choosing another to let a friend use
choosing a first place and then a second place work of art

Explanation:

Independent events are those where the outcome of one event does not affect the outcome of the other. When choosing a card from one deck and then choosing a card from another deck, the selection from the first deck has no impact on the selection from the second deck. In the other cases, the first - choice affects the second - choice (e.g., choosing a calendar date reduces available dates for the backup date).

Answer:

choosing one card from a deck and then choosing one card from another deck