we have the numbers 1-10 on each of 4 suits of cards, the others are Jack,Kind and Queen. So there are fours 2s, fours 4s four 6s four 8s and four 10s which is 4x5 or 20 even cards.. There are also 20 odd ones, so 40 even and odd then add 4x3=12 J,K, Q and you have 52 cards
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The answer depends on how many cards are picked, whether they are picked at random, from what sort of pack, and whether or not cards are replaced before the next one is picked. The probability that a single card, picked at random from a regular 52 card deck is red, is 0.5
An ace of spades.
The probability that a random card picked from a standard pack is a Jack is 1/13.
There are four suits in a deck of cards with equal numbers of cards per suite, so the chance of drawing a heart is 1/4 and a spade is 1/4 too. To draw a heart, replace it, then draw a spade, 1/4x1/4 = 1/16, or a 6.25% chance.