The probability of the first toss being a prime and the second toss resulting in a 5 is
.
The requested probability is
, where
and
.
To find the probability of the intersection of two events, we can use the formula:
![[P(A \cap B) = P(A) * P(B)]](https://img.qammunity.org/2024/formulas/mathematics/high-school/l6xybyhlu0oklj821bkqmwpt1jko33ygjd.png)
The probability of the first toss being a prime is
since there are 3 prime numbers (2, 3, 5) on a standard die, and the die has 6 faces.
The probability of the second toss resulting in a 5 is
since there is 1 face with a 5 out of 6 faces.
Therefore, the probability of both events occurring is:
=
![(3)/(6) * (1)/(6) = (1)/(12)]](https://img.qammunity.org/2024/formulas/mathematics/high-school/hgs4wvm0u8towi8fsdqp0o5l63aksybv69.png)
So, the probability of the first toss being a prime and the second toss resulting in a 5 is
.
Complete question:
Suppose a die is rolled twice and let
A = {first toss is a prime} C = {second toss is a 5}
Find the requested probability. (Enter the probability as a fraction.) P(A n B)