10. A bag contains 8 white candies and 6
red candies. If 4 candies are drawn at
random, what is the probability that it will
contain exactly 2 white and 2 red candies
A) 13/79
B) 420/1001
C) 24/59
D) 37/47
Answers
Answer:
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Related Question ⤵️
The box contains 5 green candies, 7 red, 15 blue, and 20 yellow. Someone is taking candies from the box in random. What's the least number of candies he has to take to ensure that at least two of them will be yellow?
Answer ⤵️
If there is any way that all the candies can be non yellow, then you can’t guarantee that you have even ONE yellow candy.
This means that the worst case scenario is that you have all the green, red, and blue candies and no yellow candies before you get your first yellow candy. The good news is, if you’re guaranteed one yellow candy, then it’s also guaranteed that by taking one more candy, you’re guaranteed to have two yellow candies.
5+7+15+2=29 candies must be taken before it’s impossible that you have fewer than two yellow candies.