\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \( P(X) = 0.7 \), \( P(Y) = 0.4 \) and \( P(X \text{ and } Y) = 0.2 \).
Calculate \( P(X \text{ or } Y) \).
\( P(X \text{ or } Y) = \)