Question

You are dealt one card from a​ 52-card deck. find the probability that you are not dealt a seven.

Answer 1

Number of cards in a deck = 52

Number of sevens in the deck = 4

P(seven) = 4/52 = 1/13

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

Answer: 12/13

Answer 2

There are 4 suits in a deck, hence there will be 4 sevens in a deck.

$52 - 4 = 48$

Probability that you are not dealt a seven :
$\dfrac{48}{52} = \dfrac{12}{13}$

Answer : 12/13

Hope this helps. - M