$A$ box contains $5$ red,$8$ white,and $4$ green balls. If a ball is drawn at random from the box,find the probability that the ball drawn is red.

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 multiple of $11$. (in $/25$)

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $13$ is ..............

$A$ 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 ..........

Two balanced dice are rolled. Find the probability that the sum of numbers on two dice is odd.

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 ball is not blue.