$A$ coin is tossed twice. The probability of getting head both the times is

$A$ bag contains $4$ white,$5$ red,and $6$ black balls. If two balls are drawn at random,then the probability that one of them is white is

$A$ bag contains $8$ red and $7$ black balls. Two balls are drawn at random. The probability that both the balls are of the same colour is

The probability of getting $4$ heads in $8$ throws of a coin is:

What is the probability that $1$ card drawn at random from a pack of $52$ playing cards is either a queen or an ace?

Bag $A$ contains $4$ green and $3$ red balls and bag $B$ contains $4$ red and $3$ green balls. One bag is selected at random and a ball is drawn,which is found to be green. What is the probability that it came from bag $B$?