A bag contains $5$ white, $7$ black and $4$ red balls. Three balls are drawn from the bag at random. The probability that all the three balls are white, is
$\frac{3}{{16}}$
$\frac{3}{5}$
$\frac{1}{{60}}$
$\frac{1}{{56}}$
Out of $40$ consecutive natural numbers, two are chosen at random. Probability that the sum of the numbers is odd, is
Mr. $A$ has six children and atleast one child is a girl, then probability that Mr. $A$ has $3$ boys and $3$ girls, is -
If four vertices of a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is
An ordinary cube has four blank faces, one face marked $2$ another marked $3$. Then the probability of obtaining a total of exactly $12$ in $5$ throws, is