9. Cards with numbers 2 to 101 are placed in a box. A card is selected

1.	9. Cards with numbers 2 to 101 are placed in a box. A card is selected at random. Find the probability[CBSE Sample Paper 2011, CBSE 2012]that the card has a square number
Answer» Total number of cards in the box = 100 Let A be the event of getting a number which is a perfect square. Elementary events favourable to the event A are 4, 9, 16, 25, 36, 49, 64, 81 and 100. ∴ Number of cases in favour of the event A = 9 We know that, Probability will be 9/100

9. Cards with numbers 2 to 101 are placed in a box. A card is selected at random. Find the probability[CBSE Sample Paper 2011, CBSE 2012]that the card has a square number

Answer»

Total number of cards in the box = 100

Let A be the event of getting a number which is a perfect square.

Elementary events favourable to the event A are 4, 9, 16, 25, 36, 49, 64, 81 and 100.

∴ Number of cases in favour of the event A = 9

We know that,

Probability will be 9/100