03/18/2022: Hello everyone? I need to learn which is the correct contrapositive (3) below.

Could anyone help?

A park contains at most five of seven kinds of trees--firs, laurels, maples, oaks, pines, spruces, and yews --

Admin Note: deleted the question because it is against our Forum Rules to post full LSAT questions on the Forum.

Analysis:

Steps 1-4

F L M O P S Y (max 5)

If M, not Y

If Y, not M

If F, not P

If P, not F

If not Y, (Exactly one of L / O)

If L and O, Y (my question, it is supposed to be not Y isn't it)

If not L and not O, Y

If not L or not O, F and S

If not F or not S, L and O

Admin Note: https://classic.7sage.com/lsat_explanations/lsat-b-section-2-game-2/