Dialling a telephone number an old man forgets the last two digitsremembering only that these are different dialled at random. The probabilitythat the number is dialled correctly is`1//45`b. `1//90`c. `1//100`d. none of theseA. `1//45`B. `1//90`C. `1//100`D. none of these

Dialling a telephone number an old man forgets the last two digitsreme

1.	Dialling a telephone number an old man forgets the last two digitsremembering only that these are different dialled at random. The probabilitythat the number is dialled correctly is`1//45`b. `1//90`c. `1//100`d. none of theseA. `1//45`B. `1//90`C. `1//100`D. none of these
Answer» Correct Answer - B There are 10 digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. The last two digits can be dialled in `.^(10)P_(2)` = 90 ways out of which only one way is favorable, thus, the required probability is `1//90`.

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Dialling a telephone number an old man forgets the last two digitsremembering only that these are different dialled at random. The probabilitythat the number is dialled correctly is`1//45`b. `1//90`c. `1//100`d. none of theseA. `1//45`B. `1//90`C. `1//100`D. none of these

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