SOLUTION: In a group of 30 people, what is the probability that at least 2 people will have the same birthday? Round answer to 2 decimal places. a)0.07 b)0.29 c)0.71 d)0.93

Question 24766: In a group of 30 people, what is the probability that at least 2 people will have the same birthday? Round answer to 2 decimal places.
a)0.07
b)0.29
c)0.71
d)0.93
Found 2 solutions by Paul, JWG:
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
2 divided by 30 = 0.07

a)0.07
Paul.
Answer by JWG(21) (Show Source): You can put this solution on YOUR website!
Calculate the percentage you will not find a group of two people in a larger group of 30 that share the same birthday:
(365!/(365-30)!)/365^30 = 29%
100%-29% = 71%
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