$2$ dice are thrown. Find the odds in favour of getting the sum $4$.

$2$ dice are thrown. Find the probability of getting a sum more than $7$.

$A$ box contains $2$ black,$4$ white,and $3$ red balls. One ball is drawn at random from the box and kept aside. From the remaining balls in the box,another ball is drawn at random and kept aside the first. This process is repeated until all the balls are drawn from the box. The probability that the balls drawn are in the sequence of $2$ black,$4$ white,and $3$ red is

An urn contains $10$ green,$12$ yellow,and $11$ white balls. What is the probability that when $2$ balls are selected,both are green?

$A$ bag contains $13$ white and $7$ black balls. $2$ balls are drawn at random. What is the probability that they are of the same colour?

If four vertices of a regular octagon are chosen at random,then the probability that the quadrilateral formed by them is a rectangle is