Q. 10 B4.5( 11 Votes )

A box contains 90 discs which are numbered from 1 to 90. If one disc is selected at random from the box, find the probability that it bears.

a perfect square number

Answer :

There are 90 discs in a box.

Number of outcomes in which discs is selected = 90.


Total perfect square in the box –


12 = 1


22 = 4


32 = 9


42 = 16


52 = 25


62 = 36


72 = 49


82 = 64


92 = 81


Number of favourable cases = 9


Probability that discs bears a perfect square number –


P(Perfect square numbers) =


P(Perfect square numbers) =


P(Perfect square numbers) =


Probability that discs bears a perfect square number is


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