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The probability is 0, since there is no such card!
There are 4 jacks in a pack of cards. There are 52 cards in a deck, so the probability of getting a jack is 4/52. This can be simplified to 1/13. There are also four 4s in a deck, so the probability of drawing a 4 is also 1/13. The probability of drawing a card less than six is the probabilities for drawing a 5, a 4, a 3, a 2, and an ace all added up. This is 5/13.
The probability of tossing a coin and getting heads is 0.5
The probability of drawing a five or a jack from a standard deck of 52 cards is 8 in 52, or 2 in 13, or about 0.1538.
The probability of choosing a 10 is 4/52; likewise a Jack is 4/52. The probability of 10 or Jack is 4/52 + 4/52 = 8/52 or 2/13.