Children Probablity
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John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?
Hint: It is not 1/2 as you would first think. 
1/4
Probabilities of individual events are independent of each other and the outcome of the first (or subsequent) events. Hence, the probability of the second child to be a girl will be 1/2 x 1/2 = 1/4
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