From $10,000$ lottery tickets numbered from $1$ to $10,000$,one ticket is drawn at random. What is the probability that the number marked on the drawn ticket is divisible by $20$?

Study the given information carefully to answer the question that follows. An urn contains $4$ green,$5$ blue,$2$ red,and $3$ yellow marbles. If $3$ marbles are drawn at random,what is the probability that at least $1$ is yellow?

There are $5$ volumes of Mathematics among $25$ books. They are arranged on a shelf in random order. The probability that the volumes of Mathematics stand in increasing order from left to right (the volumes are not necessarily kept side by side) is

Two dice are thrown. Find the probability that the sum is an even number.

In a simultaneous toss of $2$ coins,find the probability of getting $2$ tails.

Three dice are thrown simultaneously. What is the probability of obtaining a total of $17$ or $18$?