If two dice are thrown simultaneously,what is the probability of getting $1$ on the first die?

If two fair dice are rolled,then the probability that the sum of the numbers on the upper faces is at least $9$,is

One die and a coin (both unbiased) are tossed simultaneously. The probability of getting $5$ on the top of the die and tail on the coin is

If in a lottery there are $5$ prizes and $20$ blanks,then the probability of getting a prize is

$A$ coin is tossed twice. What is the probability that at least one tail occurs?

$A$ bag contains $9$ discs of which $4$ are red,$3$ are blue and $2$ are yellow. The discs are similar in shape and size. $A$ disc is drawn at random from the bag. Calculate the probability that it will be yellow. (in $/9$)