A single card is drawn at random from a standard 52 card deck.

Work out in its simplest form:

P (10)

=

P (not 10)

=

There are four 10 cards in the deck, so P (10) = 4/52 = 1/13

P (not 10) = 1 - P (10). This is because the maximum probability is 1, and the card you draw will either be 10, or not a 10.

P (not 10) = 1 - 1/13 = 13/13 - 1/13 = 12/13