Question

a card is drawn from standard deck. what is, the probability that card is an ace​

Answer 1

Answer:

There are 13 spade cards in the deck of 52 cards.

Probability for the card to be a spade = P1=1352=14

There are 4 aces in 52 cards.

Probability for the card to be Ace = P2=452=113

There is only one Ace Spade card.

Probability for the card to be an ace and spade = P12=152

Probability for the card to be a spade or an ace = P3=P1+P2−P12

P3=14+113−152=413

Probability for the card to be a spade or an ace or both :

Probability for the card to be both Ace and Spade is a subset of “Probability for the card to be a Spade or an Ace” and therefore the probability is same as P3