(4),(3),2,4,6,7,8

We can divide the five numbers of 24678 into the following two groups (2, 6, 8 and 4, 7), then the problem comes (), 2, 6, 8 and (), 4, 7 must be similar series, it is not difficult to see that the previous number plus the following number equals the third number, which is 4+2 = 6, 2+6 = 8, 3 at a time.

This is my answer, my idea is relatively simple, because I have been taking the civil service exam, so I am sensitive to such questions. Please forgive me for the wrong answer!