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  • A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears a two-digit number

18.(i)   A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears  a two-digit number

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Total number of discs = 90

Number of discs having a two-digit number between 1 and 90 = 81

\therefore P(getting\ a\ two-digit\ number) = \frac{favourable\ outcomes}{total\ outcomes} = \frac{81}{90}

= \frac{9}{10} 

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HARSH KANKARIA

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