$A$ die has two faces each with number $1$,three faces each with number $2$,and one face with number $3$. If the die is rolled once,determine $P(\text{not } 3)$.

If three students $A, B, C$ independently solve a problem with probabilities $\frac{1}{3}, \frac{1}{4}$ and $\frac{1}{5}$ respectively,then the probability that the problem will be solved is

From the word $POSSESSIVE$,a letter is chosen at random. The probability of it being $S$ is

$A$ coin is tossed twice. What is the probability that at least one tail occurs?

When two dice are thrown,what is the probability of getting a sum of $7$ (in $/36$)?

If $A$ and $B$ are events having probabilities $P(A)=0.6$, $P(B)=0.4$, and $P(A \cap B)=0$, then the probability that neither $A$ nor $B$ occurs is