$A$ number is chosen at random from the first ten natural numbers. The probability that the number is odd and a perfect square is

Two dice are rolled simultaneously. The probability that the sum of the two numbers on the dice is a prime number is:

In a simultaneous throw of a pair of dice,the probability of getting a total more than $7$ is

If $P(A)=0.59, P(B)=0.30$ and $P(A \cap B)=0.21$,then $P(A^{\prime} \cap B^{\prime})$ is equal to

If $P(A \cup B)=0.8$ and $P(A \cap B)=0.3$, then $P(A^C)+P(B^C)$ is equal to

The probability that a person $A$ completes a work in a given time is $\frac{2}{3}$ and the probability that another person $B$ completes the same work in the same time is $\frac{3}{4}$. If both $A$ and $B$ start doing this work at the same time,then the probability that the work is completed in the given time is