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Birthday “Paradox”
There are N people in a room.
What is the probability that two
people have the same birthday?
1
Match Probabilities
Choose a number (0..9)
Now pick a number at random, what
is the probability of getting the
chosen number?
Try
Fail
Success
1
0.90
0.1
2
0.81
0.19
3
0.73
4
Pick numbers at random (0..9)
What is the probability that you
get two numbers with same
value?
Try
Fail
Success
2
0.9000
0.1000
3
0.7200
0.2800
0.27
4
0.5040
0.4960
0.66
0.34
5
0.3024
0.6976
5
0.59
0.41
6
0.1512
0.8488
6
0.53
0.47
7
0.0605
0.9395
7
0.48
0.52
8
0.0181
0.9819
8
0.43
0.57
9
0.0036
0.9964
9
0.39
0.61
10
0.0004
0.9996
10
0.35
0.65
11
0.0000
1.0000
2