The probability of an event of a mango growing on an acacia tree is ..........

Find the probability that there is a Sunday on $26$ January in any given year.

Find the probability of getting $51$ marks out of $50$ marks.

In cricket,Rohit hits a century in $4$ innings out of $10$ innings. Find the probability that he did not hit a century.

$A$ box contains $100$ cards marked with numbers $1$ to $100$. If one card is drawn at random from the box,find the probability that the number on the card is: $(1)$ a multiple of $7$,$(2)$ a number smaller than $30$,$(3)$ a prime number.

At a fair, $70$ boys, $80$ girls, $20$ men, and $30$ women have come. Find the probability that a person selected at random to be a prize winner is a woman.