$A$ fair coin is tossed repeatedly. If a tail appears on the first four tosses,then the probability of a head appearing on the fifth toss equals:

$A$ coin is tossed $3$ times by $2$ persons. What is the probability that both get an equal number of heads?

In a certain town,$40\%$ of the people have brown hair,$25\%$ have brown eyes,and $15\%$ have both brown hair and brown eyes. If a person selected at random from the town has brown hair,what is the probability that they also have brown eyes?

Three integers are chosen at random from the first $20$ integers. The probability that their product is even is:

From a pack of $52$ cards,two are drawn with replacement. The probability that the first is a diamond and the second is a king is:

$A$ bag contains $5$ white,$7$ black and $4$ red balls. Three balls are drawn from the bag at random,then the probability that all the three balls are white,is