Chance and Probability

A multiple choice question has five options and only one of them is the correct answer. If a boy picks an option at random, what is the probability that it is not the correct answer?

A day of the week is chosen at random. Find the probability that the day chosen is a day that has the letter 'u' in its spelling.

A day of the week is chosen at random. Find the probability that the day chosen is a Monday

In a batch of $20$ vases, there are four defective vases. A quality control inspector checks the vases in the batch one by one without repetition. If the first vase checked is defective, find the probability that the second vase checked is also defective.

In a batch of 20 vases, there are four defective vases. A quality control inspector checks the vases in the batch one by one without repetition. Find the probability that the first vase checked is defective.

A store has $15$ LCD TV sets and $n$ Smart TV sets on display. A TV set at random and the probability of selling a Smart TV set is $\frac{4}{9}$ Find the value of $n$.

There are 9 marbles in a box marked as $1, 2, 3, 4, 5, 6, 7, 8$ and $9.$ A marble is drawn at random. What is the probability of drawing marble with number $7$ or $9$ ?

There are 9 marbles in a box marked as $1, 2, 3, 4, 5, 6, 7, 8$ and $9.$ A marble is drawn at random. What is the probability of drawing marble with number $3?$

There are $12$ mathematics books and $8$ science books on a shelf. Three of the science books are biology books. A book is taken at random from the shelf. Find the probability that the book is a science book that is not a biology book.

There are $12$ mathematics books and $8$ science books on a shelf. Three of the science books are biology books. A book is taken at random from the shelf. Find the probability that the book is not a biology book

There are $12$ mathematics books and $8$ science books on a shelf. Three of the science books are biology books. A book is taken at random from the shelf. Find the probability that the book is a mathematics book.

There are $12$ mathematics books and $8$ science books on a shelf. Three of the science books are biology books. A book is taken at random from the shelf. Find the probability that the book is a history book

A letter is chosen at random from the word 'MATHEMATICS'. Find the probability that the chosen letter is the letter 'K'

There are three yellow roses, four white roses and five red roses in a bouquet of flowers. If a rose is selected at random from the bouquet, find the probability that the rose is blue.

There are three yellow roses, four white roses and five red roses in a bouquet of flowers. If a rose is selected at random from the bouquet, find the probability that the rose is red.

There are three yellow roses, four white roses and five red roses in a bouquet of flowers. If a rose is selected at random from the bouquet, find the probability that the rose is white.

There are $12$ eggs in a basket, of which two are rotten. If an egg is picked randomly from the basket, what is the probability of getting an egg that is not rotten?

A box contains ten chips that are numbered from $1$ to $10.$ A chip is drawn at random from the box. Find the probability that the number on the chip is a multiple of $4.$

A box contains ten chips that are numbered from $1$ to $10.$ A chip is drawn at random from the box. Find the probability that the number on the chip is a prime.

A box contains ten chips that are numbered from $1$ to $10.$ A chip is drawn at random from the box. Find the probability that the number on the chip is greater than $7$