On average, one out of 10 persons is busy. If six persons are selected at random, then the probability that at least 5 of them will be busy is...

If a discrete random variable $X$ takes the values $1, 2, 3, 4$ such that $2P(X = 1) = 3P(X = 2) = P(X = 3) = 5P(X = 4)$, then $P(X = 4) = \ldots$

Three numbers are chosen from 1 to 30. The probability that minimum is 10 and maximum is 26 is _______

There are two vectors $\vec{A} = 6\hat{i} + 9\hat{j} - \hat{k}$ and $\vec{B} = 2\hat{i} + 3\hat{j} - p\hat{k}$ which have the same direction. The value of 'p' is