If $P(C) = \frac{2}{5}$,then $P(\bar{C}) = \ldots \ldots \ldots$

There are $5$ white,$7$ red,$4$ black and $2$ blue identical balls in a box. One ball is selected at random from the box. Find the probability that the selected ball is either red or black. (in $/18$)

$A$ card is selected at random from a well-shuffled pack of $52$ cards. Find the probability that the selected card is that of spades.

$A$ game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers $1, 2, 3, \dots, 11, 12$ on a circular disc. All these outcomes are equally likely. Then, the probability that the arrow rests to point at $7$ is ..........

If $I$ toss a coin $3$ times and get a head each time,should $I$ expect a tail to have a higher chance in the $4^{th}$ toss? Give a reason in support of your answer.

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 $/5$)