The answer is Total number of coins = 50
∴ Total outcomes = 50
prime numbers between 51 to 100 are = 53,59,61,67,71,73,79,83,87,97
Total prime numbers = 10
p(prime number) =
50
10
=
5
1
Since, P(prime number) + P(not a prime number) = 1
∴
5
1
+ P( not a prime number) = 1
∴ P(not a prime number) = 1−
5
1
=
5
4
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