Hello,

P(X=2) means that you draw the same number during the first two drawings.

So the first draw will give a number a, the second draw will give the second number a.

Whatever the first number is, the second has to be the same... so among the 7 remaining tickets, you have to pick a specific ticket.

So the probability will be 1/7

But maybe they want you to have a different reasoning... Like thinking with combinations or arrangements.