First of all, you need to know what stratified sampling is, that is, random sampling in proportion, so you choose 4 boys and 2 girls.

C42*C84 middle draw, then row, two women and one man, no height.

Take out three boys who are not the tallest, arrange the girls in two, A22*C3 1, tie them up, and then arrange them with the other two boys who are not the tallest, with A33=6.

But a boy on both sides has two roads, and then the tallest one has two roads.

Both boys have four rows on one side, and the top row is also two rows (sweat, sorry, it's heavy, so I don't need to discuss it here)

Finally, C42 * C84 * A22 * C31* A33 * 2 = 30240.

You piss me off I thought I always miscalculated.