Given the interval of 1-12 inclusive, Find the
probability of having an even number or a prime number.

__Solution__
This is a non-mutually exclusive event.

n(S) =
number of sample space = 12

Let P(E)=
probability of even numbers =

^{6}/12
Let P(R)=
probability of prime numbers =

^{5}/12
P(EnR) =
probability of having both even and prime numbers=

^{1}/12
∴ P(EuR) =
P(E) + P(R) - P(EnR).

P(EuR) =

__6__+__5__–__1__
12 12
12

P(EuR) =

__11__-__1__
12 12

P(EuR) =

__10__
12

**Hence probability of an even number or a prime number is**

^{5/}6.

__TRY THIS........__
Given the interval of 1-15 inclusive, find the
probability of having an even number or a prime number.

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