Question

a card is drawn from a standard deck of cards. What is the probability of drawing a red card or a spade?
a. 1/2
b. 1/4
c. 3/4
d. 1/8

Answer 1

How many red cards are there? How many spades? Sum them. Can a spade be red? If so, count them and subtract from the previous sum.

Take this result and divide by 52, the number of cards in a standard deck.

Answer 2

i dont have a deck of cards?

Answer 3

Here is one I can let you have - http://upload.wikimedia.org/wikipedia/commons/b/b3/Set_of_playing_cards_52.JPG

Answer 4

This is a spade - http://cdn-6.freeclipartnow.com/d/36618-1/card-icon-spade.jpg

Answer 5

So given the pictures above, how many spades do we have?
How many red?
Are there any red spades?

Answer 6

13 spades. there are no red spades

Answer 7

and how many red?

Answer 8

26

Answer 9

So add those together and divide by 52, the total number of cards in a standard deck.

That's it! :)

Answer 10

I got C. :) thank you for your help!

Answer 11

BTW, look at the 1st link I sent you above. Notice that one row is a spade and two other rows are red. There is only one row that is neither red or a spade. In other words, 3 out of 4 rows match the criteria -- so probability is 3/4 of either a red card or a spade.

Answer 12

You could have done this using the "visual" technique and without calculations.