Question

A card is drawn from a standard deck of cards. Find the probability that it is a 4 or a red card.

Answer 1

the standard deck is 52 cards

Answer 2

consider the red cards, they will be hearts or diamonds, so half of the 52 will be read

Answer 3

info:
-A standard deck of cards has 52 cards
-There are four suits that count up from ace to King, so 10 + 3 would make 13 cards per suit.
-There are two red suits (hearts and diamonds) and two black suits (clubs and spades).
-There is one chance of getting 4 in one suit.

conclusion:
-red suits: 1/2 chance (2 suits out of 4)
-the number 4: once per suit * four suits = 4 chances out of 52 cards.

Answer 4

._.;

Answer 5

there are 13 types of cards, so the chance of a 4 is simply 1/13

Answer 6

Okay maybe I shouldn't have spent two minutes typing that up.

Answer 7

because the events are independent, we can have 1/2x1/13 = 1/26 am i right?

Answer 8

...

Answer 9

Okay, yes, I believe I am following (thank you both very much for the efforts given)

Answer 10

@CrashOnce is my info incorrect? ._.; (I'm asking seriously.)

Answer 11

no worries

Answer 12

You're welcome. ^^;

Answer 13

no its right

Answer 14

Okay... I thought you were correcting me there but I wasn't sure xD

Answer 15

@roseflutterwings do you still need help? :o

Answer 16

uhm so would the final answer be 1/26 because it is an independent event? Is that all?

Answer 17

i believe so

Answer 18

Okay, great :) I can see it. Thank you both!

Answer 19

no probs

Answer 20

^-^

Answer 21

You can solve this by looking at the 52 card sample space and counting the sample points by hand. Or you can use the formula
P( A or B ) = P(A) + P(B) - P(A & B )
Therefore...
P( 4 or red card) = P(drawing a 4) + P( drawing red card) - P( drawing four & red)
= 4/52 + 26/52 - 2/52