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28 Jan 2021, 05:05
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Difficulty:
95%
(hard)
Question Stats:
13% (01:23) correct
88%
(01:03)
wrong
based on 96
sessions
History
Date
Time
Result
Not Attempted Yet
Two girls have their birthdays in the same week. It is known that one of the girls was born on a Saturday, what is the probability that both were born on a Saturday?
A. 1/2
B. 1/4
C. 1/7
D. 1/13
E. 1/14
Are You Up For the Challenge: 700 Level Questions: 700 Level Questions
A. 1/2
B. 1/4
C. 1/7
D. 1/13
E. 1/14
Are You Up For the Challenge: 700 Level Questions: 700 Level Questions
08 Feb 2021, 12:16
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Bunuel
Solution:
Since we already know that one of the girls was born on a Saturday (probability = 1), the probability that the other girl was born on a Saturday is 1/7. Thus, the probability that both were born on Saturday is 1 x 1/7 = 1/7.
Answer: C
13 Feb 2021, 16:28
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We already know the first girl was born on Saturday. So the question is, what's the probability that the 2nd girl will be born on Saturday? 1/7
Answer is C.
There is something glitchy with the choices though.
Answer is C.
There is something glitchy with the choices though.
