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We draw a card from a Spanish deck of $40$ cards and check the number on it. We consider the event $\mathrm{A}$: Draw an even number. What is the probability of the event $\mathrm{A}$? Recall briefly Spanish $40$ card deck: each of four suits (colors) contains $1$, $2$, $3$, $4$, $5$, $6$, $7$, Jack $(10)$, Horse $(11)$ and King $(12)$.