swifty125
20.01.2020 •
Mathematics
Amagician has a collection of 52 cards, with 26 red and 26 black cards. four of these cards are classified as 'special', and two of the special cards are red. if a card is chosen at random from the 52 cards, what is the probability that the card is special or red? select one:
a. 2/52
b. 28/52
c. 26/52
d. 4/52
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Ответ:
option B (28/52)
Step-by-step explanation:
from probability
P(A∪B)=P(A)+P(B)-P(A∩B)
where
P(A∪B) = probability that event A or B happen
P(A∩B) = probability that event A and B happen simultaneously
P(A) = probability that event A happen
P(B) = probability that event B happen
the probability that the card is special or red
P( special or red)= P(special) + P(red) - P( special and red)
since
P(special)= 4/52
P(red) = 26/52
P( special and red) = 2/52
therefore
P( special or red)= 4/52 + 26/52 - 2/52 = 28/52
P( special or red)= 28/52
(option B)
Ответ:
2 tons = 4,000 pounds
3 tons = 6,000 pounds