In a college of $300$ students, every student reads $5$ newspapers and every newspaper is read by $60$ students. The number of newspapers is
At least $30$
At most $20$
Exactly $25$
None of the above
A coin is tossed $3$ times by $2$ persons. What is the probability that both get equal number of heads
A fair coin is tossed four times, and a person win $\mathrm {Rs.}$ $1$ for each head and lose $\mathrm {Rs.}$ $1.50$ for each tail that turns up. From the sample space calculate how many different amounts of money you can have after four tosses and the probability of having each of these amounts.
In a single throw of two dice the probability of obtaining an odd number is
If $A$ is a sure event, then the value of $P (A$ not ) is
Three dice are thrown simultaneously. What is the probability of obtaining a total of $17$ or $18$