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A box contains 90 discs which are number...

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 .

Text Solution

Verified by Experts

The correct Answer is:
`= 9/10`
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Knowledge Check

  • A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears a prime-number less than 23, is:

    A
    `7/90`
    B
    `10/90`
    C
    `4/45`
    D
    `9/89`

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