Probability of a System

Given below is a normalized wave function

${psi}(x)$ = $\frac{2}{\sqrt{10}}{psi}_{1}(x)$ + $\frac{1}{\sqrt{2}}{psi}_{2}(x)$ + $\frac{1}{\sqrt{10}}{psi}_{3}(x)$

Where ${psi}_{1}(x)$ , ${psi}_{2}(x)$ , ${psi}_{3}(x)$ are mutually orthogonal.

Calculate the probability of finding the system in the state of ${psi}_{1}(x)$