Probability: 48/49 * 47/48 * 46/47 * 45/46 * 44/45 * 43/44 = 43/49.
The seventh is 49.
Probability: 1/43
So the probability that the last one is 49 is: 43/49* 1/43= 1/49.
In other words, the probability of opening any number at any position is the same.
This truth is like drawing lots.