Solution
= Solution
The exponential memoryless property gives
$$
\boxed{\mathbb P(V\leq t\mid V>s)
=1-\mathbb P(V>t\mid V>s)
=1-e^{-(\lambda_1+\lambda_2)(t-s)}.}
$$
= Solution
The exponential memoryless property gives
$$
\boxed{\mathbb P(V\leq t\mid V>s)
=1-\mathbb P(V>t\mid V>s)
=1-e^{-(\lambda_1+\lambda_2)(t-s)}.}
$$