The probability of getting a king and a spade card when two cards are drawn simultaneously from a pack of $52$ playing cards is

The probability that the three cards drawn from a pack of $52$ cards are all red is

Three numbers are chosen at random from numbers $1$ to $20$. The probability that they are consecutive is

If three dice are thrown simultaneously,then the probability of getting a score of $7$ is

If three numbers are drawn at random successively without replacement from a set $S = \{1, 2, \ldots, 10\}$,then the probability that the minimum of the chosen numbers is $3$ or their maximum is $7$ is:

The coefficients $a, b, c$ in the quadratic equation $ax^2 + bx + c = 0$ are chosen from the set $\{1, 2, 3, 4, 5, 6, 7, 8\}$. The probability of this equation having repeated roots is: