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 $/25$)

Cards with numbers $2$ to $101$ are placed in a box. $A$ card is selected at random. Find the probability that the card has
$(i)$ an even number
$(ii)$ a square number

$A$ balanced die is rolled twice. Then,the probability of the event that an even number is received both the times is ..........

$A$ balanced die is rolled once. Then,the probability that the number on the die is greater than $3$ is ........

The probability of the Sun setting in the west is $\ldots \ldots \ldots$

$A$ bag contains $24$ balls of which $x$ are red,$2x$ are white,and $3x$ are blue. $A$ ball is selected at random. What is the probability that it is:
$(i)$ not red?
$(ii)$ white?