From a bag containing 30 tickets numbere...

From a bag containing 30 tickets numbered 1, 2, 3, ... 30, three tickets are selected at random without replacement. Suppose these tickets are arranged as `x_1 lt x_2 lt x_3`. The probability that `x_2` = 15 and `x_3 gt 20`, is

`1//29`

`1//7`

`1//19`

`1//11`

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