Bunuel wrote:
Bakshi121092 wrote:
Hi Bunuel,
What is wrong in the following approach?
Cases considered :
1. Born in a leap year
2. Not born in a leap year
In that case, the probability of not born in a leap year =1/2
And subsequently, the probability that at least one of them is born in a leap year would turn out to be greater than 50% for 2 people.
Please help.
Thank you.
Let me ask you: is the probability that you win a lottery 1/2?
1. You win the lottery
2. You won't win the lottery
Or: what is the probability to meet a dinosaur on the street? Is it 1/2? Either you meet it or not?
22. Probability
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ALL YOU NEED FOR QUANT ! ! !Ultimate GMAT Quantitative Megathread.
I understand. But the question doesn't mention a time frame.
For example, considering the probability to be 3/4 is for any 4 year time frame. If we consider a 5 year time frame, the probabilities change.
The probabilities you asked depend on other factors. One can simply not tell. But with no other information given, the probability that I could meet a dinosaur would be 1/2. I may or may not encounter a dinosaur.
Please help.
Thanks.