Q. 10 A4.4( 5 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 two- digit number

Answer :


There are 90 discs in a box.

Number of outcomes in which discs is selected = 90.

Discs are numbered from 1 to 90.

total 2 digits numbers = 90 – 9 ( 1 to 9 will be one digit numbers)

Total 2 digits numbers = 81

favourable outcomes = 81

Probability that discs bears a two- digit number –

P(two digit numbers) =

P(two digit numbers) =

P(two digit numbers) =

Probability that disc bears two digit number is

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