Solution
= Solution
The addition formula for <probability> subtracts the overlap, which vanishes for <mutually exclusive events>:
$$
\mathbb P(A\cup B)=\mathbb P(A)+\mathbb P(B)-\mathbb P(A\cap B)
=\boxed{\mathbb P(A)+\mathbb P(B)}.
$$
= Solution
The addition formula for <probability> subtracts the overlap, which vanishes for <mutually exclusive events>:
$$
\mathbb P(A\cup B)=\mathbb P(A)+\mathbb P(B)-\mathbb P(A\cap B)
=\boxed{\mathbb P(A)+\mathbb P(B)}.
$$