A determinant is chosen at random. The set of all determinants of order $2$ with elements $0$ or $1$ only. The probability that value of the determinant chosen is positive, is
$3/16$
$3/8$
$1/4$
None of these
Three fair coins are tossed. If both heads and tails appears, then the probability that exactly one head appears, is
On her vacations Veena visits four cities $( A ,\, B ,\, C$ and $D )$ in a random order. What is the probability that she visits $A$ just before $B$ ?
An experiment consists of recording boy-girl composition of families with $2$ children. What is the sample space if we are interested in the number of girls in the family?
If in a lottary there are $5$ prizes and $20$ blanks, then the probability of getting a prize is
In a college of $300$ students, every student reads $5$ newspapers and every newspaper is read by $60$ students. The number of newspapers is