The probability is 1 - if you pick 40 cards without replacing them.
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The probability, if you draw 40 cards, without replacement, is 1. That is, it is a certainty. The probability on a single random draw is 1/4.
50%
If the selection is random, the probability is 16/52 = 4/13.
If you randomly pick a card from a standard deck of cards, that probability will be 1/4, since 1/4 of the cards are heart.
There are only 4 suits in an ordinary deck of playing cards. The probability of drawing a heart is 1 in 4, or 0.25.