Three dice are thrown. The sum of the numbers is $15$. What is the chance of getting $4$ on the first die?

$A$ determinant is chosen at random from the set of all determinants of order $2$ with elements $0$ or $1$ only. The probability that the determinant chosen is non-zero is

$2$ dice are thrown. Find the odds in favour of getting the sum $5$.

The chance of getting a doublet with $2$ dice is

An urn contains $25$ balls numbered $1$ to $25$. Suppose an odd number is considered a 'success'. $2$ balls are drawn from the urn with replacement. Find the probability of getting $3$ successes.

Five horses are in a race. $Mr. A$ selects two of the horses at random and bets on them. The probability that $Mr. A$ selected the winning horse is (in $/5$)