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A={1, 2, 3, ..., 9}. If three numbers ar...

`A={1, 2, 3, ..., 9}`. If three numbers are selected from set A and are arranged, the probability that three numbers are either in increasing order or in decreasing order.

A

`1/6`

B

`2/3`

C

`1/2`

D

`1/3`

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The correct Answer is:
D
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