Which of the following cannot be the probability of an event?

A letter is chosen at random from the word “ROSE”. Find the probability, that the letter chosen is a vowel.

Two coins are tossed simultaneously. What is the number of all outcomes?

Three coins are tossed simultaneously. What is the number of all possible outcomes?

The probability of winning a prize in a contest is

If probability of an event A is P(A) = x, then P(A') is

A die is thrown once. Find the probability of getting a number less than 3.

Which of the following is true?

Probability of picking a two-digit number randomly for which the units and ten’s places have same digits

Which of the following is not to be a probability of any event ?