Answer:

Correct option is D)

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

Option D is correct