There are chits numbered $1$ to $20$ in a box. One chit is drawn at random. Find the probability that the number on the chit is a multiple of $5$. (in $/5$)

In a shop, there are $50$ packets of tea out of which $5$ are under-weight. One packet is selected at random from the lot. Find the probability that an under-weight packet is selected.

An unbiased coin is tossed thrice. Then,the number of total outcomes is ............

$A$ card is selected at random from a well-shuffled pack of $52$ cards. Find the probability that the selected card is not a king.

Two dice are thrown together. Find the probability that the product of the numbers on the top of the dice is
$(i) \, 6$
$(ii) \, 12$
$(iii) \, 7$

In a packet of $500$ screws,$80$ screws are defective. Find the probability that a screw selected at random from the packet is non-defective. (in $/25$)