You are dealt one card from a standard 52 card deck. find the probability of being dealt in ace or a seven.

Probablity is (desired outcomes)/(total possible outcomes)
for the poeple who don't know, there are 4 suits and 13 types of cards, ace, 2,3,4,5,6,7,8,9, 10, jack, king, queen

so 4 aces total, 4 two's total, etc

4 of each card

so 4 aces+4 sevens=8 cards
8/52=2/13