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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

`1/90`

B

`1/45`

C

`2/45`

D

`89/90`

Text Solution

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The correct Answer is:
D
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