Dialing a telephone number, an old man forgets the last two digits remembering only that they are different, dialled at random. The probability that the number is dialled incorrectly

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

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 1/45b.1/90 c.1/100 d.none of these

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

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

Dialing a telephone number an old man forgets the last two digits remambering only that these are different dialled at random. The probability that the numbe is dialled correctly, is equal to 1/k, then k is

Dialing a telephone number an old man forgets the last two digits remembering only that these are different , dialling at random . The probability that the number dialled coorectly is :

Dialing a telephone number, a man forgot the last two digits and remembering only that they are different . He dialled the number at random. The probability of the number dialled correctly is :

While dialing a telephone number, an old man forgets its last two digit. If the last two digits are distinct, then the probability that a man dials true number is ......