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Three-digit numbers are formed using the...

Three-digit numbers are formed using the digits `0,1, 2, 3, 4, 5` without repetition of digits. If a number is chosen at random, then the probability that the digits either increase or decrease, is

A

`(1)/(10)`

B

`(2)/(11)`

C

`(3)/(10)`

D

`(4)/(11)`

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  19. A fair die is tossed repeated until a six is obtained. Let X denote th...

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  20. A fair die is tossed repeatedly until a six obtained. Let X denote the...

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