If the probability of two friends not having the same birthday is 0.975, what is the probability that they have same birthday ?
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Therefore, the probability that at least 2 will have the SAME birthday is 1- 0.9917958341152186 = 0.008204 . This is the compliment. Therefore there is a 0.82% chance that from three people at least 2 will have the same birthday.

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Answer:
Therefore, the probability that at least 2 will have the SAME birthday is 1- 0.9917958341152186 = 0.008204 . This is the compliment. Therefore there is a 0.82% chance that from three people at least 2 will have the same birthday.
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