A coin is based so that a head is twice as likely to occur as a tail. If the coin is tossed $3$ times, then the probability of getting two tails and one head is-
$\frac{2}{9}$
$\frac{1}{9}$
$\frac{2}{27}$
$\frac{1}{27}$
From a class of $12$ girls and $18$ boys, two students are chosen randomly. What is the probability that both of them are girls
A card is drawn at random from a pack of $100$ cards numbered $1$ to $100$. The probability of drawing a number which is a square is
Find the probability that when a hand of $7$ cards is drawn from a well shuffled deck of $52$ cards, it contains atleast $3$ Kings.
Two marbles are drawn in succession from a box containing $10$ red, $30$ white, $20$ blue and $15$ orange marbles, with replacement being made after each drawing. Then the probability, that first drawn marble is red and second drawn marble is white, is
If out of $20$ consecutive whole numbers two are chosen at random, then the probability that their sum is odd, is