The probability of an event whose likelihood of occurrence and non-occurrence is same is:

A bag contains $10$ marbles of which $8$ are red. One marble is drawn at random. The probability that it is not red is:

If a letter is taken out from a bag containing letter of the word "SNAKE", the probability of picking A is;

If a slip of paper is drawn from a jar containing $12$ slips with different months of the year written on it, then the probability of the months starting with letter 'J' is:

If a card is drawn from a well-shuffled deck of $52$ playing cards, the probability of its being both red and black is