Aiming at the problem of required documents, drawers are made according to the principle that any two numbers have multiple relationships.

Divide these eight numbers into the following four groups according to odd numbers and their multiples.

Imagine it as four drawers: (1, 2, 4, 8), (3, 6), (5), 7).

Choose five numbers from the eight numbers in the above four drawers, and take out at least two numbers from the same drawer according to the pigeon hole principle.

Because two numbers in the same drawer have multiple relationships,

So one of these two numbers must be a multiple of the other.