A number is chosen at random from first ten natural numbers. The probability that number is odd and perfect square is .

A number is selected from first 100 natural numbers. The probability that number is perfect square or a perfect cube is

A number is selected from first 100 natural numbers. The probability that number is perfect square or a perfect cube is

A number is chosen at random from the first 11 natural numbers, then the probability that the chosen number is even, is -

Find the mean of first ten odd natural numbers.

Three numbers are chosen at random from the first 20 natural numbers. The probability that their product is even is

Three numbers are chosen at random from the first 20 natural numbers. Then the probability that their product is odd is

A natural number is chosen at random from the first 100 natural numbers. What is the probability that the number chosen is a multiple of 2 or 3 or 5?

A natural number is chosen at random from the first 100 natural numbers. What is the probability that the number chosen is a multiple of 2 ro 3 or 5?

Three numbers are chosen at random from the first 20 natural numbers. The probability that their product is even is -