The answer depends on the probability that Alex makes a single shot.
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The probability the shooter makes both shots is .7 * .7 = .49, and the probability of making neither is .3 * .3 = .09. So the probability of making exactly 1 out of 2 is 1 - .49 - .9 = .42, or 42 percent.
It is 3/13. The fact that the card is black makes no difference since the probability is the same for both colours.
That probability is the product of the probabilities of the two individual events; for example, if event A has a probability of 50% and event B has a probability of 10%, the probability that both events will happen is 50% x 10% = 5%.
Both are measures of the likelihood of events.
There is a 2/6 probability of that happnening