A card is chosen at random from a standard pack. What is the probability that the card is not a black three?

A standard pack of cards contains 52 cards, with 26 red cards and 26 black cards.

There are four threes in a standard pack of cards, one of which is a black three.

Therefore, the probability of choosing a black three is 1/52.

The probability of not choosing a black three is 1 - 1/52 = 51/52.

So, the probability that the card chosen is not a black three is 51/52.

There are 52 cards in a standard deck. There are 2 black threes, so the number of cards that are not black threes is 52 - 2 = 50. Therefore, the probability of choosing a card that is not a black three is 50/52 = 25/26.