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Probability of desired outcomes is = Number of desired outcomes / total number of outcomes.

1) There are 13 clubs out of 52 total cards. So the probability of drawing a club when u draw it randomly, is 13/52 = 1/4

2) Drawing a red card... there are 13 diamonds and 13 hearts. So probability is (13+13 )/ 52 = 1/2

3) Back cards are 13 + 13. Among these two suits of clubs and spades, we have 2 through 7 --- 6 cards in clubs and 6 cards in spades. hence probability is = 12/52 = 3/13

4) There are four 7s from the four suites in the deck.. hence probability is 4/52 = 1/13.