there are (2, 3, 5) only 3 prime numbers on a single dice. 1 is not considered a prime number.
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The prime numbers from 1-6 are 2, 3, 5 (1 is not prime). There are 3 prime numbers on a dice and 6 total. therefore the probability of rolling a prime is 3/6. The probability of getting a tails when flipping a coin is 1/2. Therefore you just multiply the two. 3/6 * 1/2 = 1/4
There are infinite prime numbers as there is infinite numbers. You cannot limit the counting of primes.
16 prime numbers
15 prime numbers