The probability that an event will fail to happen is $0.05$. The probability that the event will take place on $4$ consecutive occasions is

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

$5$ boys and $5$ girls are sitting in a row randomly. The probability that boys and girls sit alternatively is

$A$ basket contains $5$ apples and $7$ oranges,and another basket contains $4$ apples and $8$ oranges. One fruit is picked out from each basket. Find the probability that the fruits are both apples or both oranges.

The probability that a contractor will get a plumbing contract is $2/3$ and the probability that he will not get an electric contract is $5/9$. If the probability of getting at least $1$ contract is $4/5$,what is the probability that he will get both?

What is the chance that a leap year selected randomly will have $53$ Wednesdays?