Dialing a telephone number an old man forgets the last two digits remembering only that these are different dialed at random. The probability that the number is dialed correctly is

Question : Dialing a telephone number an old man forgets the last two digits remembering only that these are different dialed at random. The probability that the number is dialed correctly is

(A) 1/45

(B) 1/90

(C) 1/100

(D) none of these

Answer : option (B)

Solution :

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