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Melany Maddox
6 July, 02:11
P (King or black card) ?
+5
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1
)
Ryan Ali
6 July, 03:06
0
7/13
Step-by-step explanation:
If we are looking at a standard deck of playing cards, we have 52 cards total.
*13 of each suit (there are 4 suits; spades, clubs, hearts, and diamonds)
*2 kinds of colors-black or red. Half the deck is black and half the deck is red. There are 26 reds and 26 blacks.
*There is 1 king of each suit and since there are 4 suits, then there are 4 kings.
We can make other observations.
P (King or black card)
=P (King) + P (black card) - P (king and black card)
(We are subtracting out anything that counted twice in the "and" part)
=4/52 + 26/52 - 2/52
Notes:
-P (king) = 4/52 comes from there being 4 kings in all in a deck of 52 playing cards.
-P (black card) = 26/52 comes from that half the deck is black (and the other half is red) in a deck of 52 playing cards. Technically, we could have just said this equal 1/2 here instead. I will leave as 26/52 for now so I can have a common denominator already setup.
-P (king and black card) = 2/52 comes from there being 2 black cards that are kings in a deck of 52 playing cards. We have to get rid of these 2 from the 4+26 since if we don't we would have counted them twice)
Let's simplify:
= (4+26-2) / 52
= (30-2) / 52
=28/52
Let's reduce:
= (28/4) / (52/4)
=7/13
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