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Dialling a telephone number an old man forgets the last two digits remembering only that these are different dialled at random. The probability that the number is dialled correctly is `1//45` b. `1//90` c. `1//100` d. none of these

A

`1//45`

B

`190`

C

`1//100`

D

none of these

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The correct Answer is:
B
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OBJECTIVE RD SHARMA ENGLISH-PROBABILITY -Section I - Mcqs
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  7. One ticket is selected at random from 100 tickets numbered 00,01,02, …...

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  8. If the probability that A and B will die within a year are p and q res...

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  9. Four positive integers are taken at random and are multiplied together...

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  10. Two cards are drawn from a well shuffled deck of 52 cards.The probabil...

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  11. The probability that the roots of the equation x^(2)+nx+(1)/(2)+(n)/(2...

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  12. A matrix is chosen at random from the set of all matrices with eleme...

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  13. If an integer p is chosen at random in the interval 0le ple5, then the...

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  16. If n integers taken art random are multiplied together , then the p...

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  17. If n positive integers are taken at random and multiplied together, th...

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  18. The probability that a teacher will give a surprise test during any cl...

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  20. Five coins whose faces are marked 2, 3 are thrown. What is the probabi...

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