20 cards from 11 to 30, are put in a box and mixed throughly. A card is then drawn from the box at random. Find the probability that the number on the drawn card is a prime number.

Cards marked with numbers 5 to 50 are placed in a box and mixed thoroughly. A card is drawn from the box at random. Find the probability that the number on the taken out card is (i) a prime number less than 10 (ii) a number which is a perfect square.

Cards marked with numbers 5 to 50 are placed in a box and mixed thoroughly,A card is drawn from the box at random.Find the probability that the number

Cards marked 1, 3, 5 .... 49 are placed in a box and mixed thoroughly. One card is drawn from the box. Find the probability that the number on the card is : a composite number

Cards are marked with the numbers from 2 to 151 are placed in a box and mixed thoroughly. One card is drawn at random from this box. Find the probability that the number on the card is: (i) a prime number less than 75. (ii) an odd number.

Cards marked 1, 3, 5 .... 49 are placed in a box and mixed thoroughly. One card is drawn from the box. Find the probability that the number on the card is : not a perfect square

Cards marked 1, 3, 5 .... 49 are placed in a box and mixed thoroughly. One card is drawn from the box. Find the probability that the number on the card is : divisible by 3

Cards marked with numbers 3, 4, 5, .........,50 are placed in a box and mixed thoroughly. One card is drawn at random from the box, find the probability that the number on the drawn card is a two digit number.

Cards numbered from 7 to 49 are put in a box & mixed through . A card is drawn from the box , what is the probability that the number written on it is : A prime number A multiple of 7 .

Cards marked with the numbers 2 to 101 are placed in a box and mixed thoroughly.One card is drawn from this box.Find the probability that the number on the card is: (i) an even number (ii) a number less than 14