Question

a box contains 10 cards marked with the number 1 to 10 . one card is shown from this box at random . what is the probability that number on the card is perfect square

Answer 1

Since, we've:

$probability \: of \: any \: event = \frac{number \: of \: favourble \: events \: possible}{Total \: number \: of \: events \: possible }$

Therefore in the case above:

Total number of favorable events possible is = 2 (since only two cards with perfect square number are available i.e. 4 and 9. )

and total number of events possible is = 10

Hence, probability for above condition is :

2/10 = 1/5