Question

You roll a number cube numbered from 1 to 6.

P(a prime number)

I think 3/6 or 1/2

P(not a 6) 5/6

P (an even number) 3/6 or 1/2

P (3,6,5,2, or 4) = 5/6

Answer 1

You're correct

Answer 2

1 2 3 4 5 6
primes:
1 3 5
so 3/6 = 1/2
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5/6 YES, you got a NOT !!! :)
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yes
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yes

Answer 3

but 1 is not a prime. It is explicitly excluded from the list of primes.