The probabilities of a problem being solved by two students are $\frac{1}{2},\frac{1}{3}$. Then the probability of the problem being solved is
$\frac{2}{3}$
$\frac{4}{3}$
$\frac{1}{3}$
$1$
Two dice are thrown simultaneously. What is the probability of obtaining sum of the numbers less than $11$
The probability that in a year of the $22^{nd}$ century chosen at random there will be $53$ Sundays is
Three coins are tossed once. Find the probability of getting no tails.
A locker can be opened by dialing a fixed three digit code (between $000$ and $999$). A stranger who does not know the code tries to open the locker by dialing three digits at random. The probability that the stranger succeeds at the ${k^{th}}$ trial is
A die is thrown. Describe the following events : $A$ : a number less than $7.$ Find the $A \cup B$.