Total number of outcomes in the experiment of rolling three balanced dice simultaneously is ........

$12$ defective ballpens are mixed with $132$ non-defective ballpens. They all look alike. $A$ ballpen is selected at random from that lot. Find the probability that a defective ballpen is selected.

An unbiased coin is tossed thrice. The probability of receiving more heads than tails is ........

There are boards numbered $1$ to $50$ in a box. One board is selected at random. Find the probability that the number on the board is a prime number.

The probability of getting a bad egg in a lot of $400$ eggs is $0.035$. The number of bad eggs in the lot is:

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $7$ is ............