why the reasoning is flawed

lily88888UID: 2828533

At the company picnic, all of the employees who participated in more than four of the scheduled events, and only those employees, were eligible for the raffle held at the end of the day. Since only a small proportion of the employees were eligible for the raffle, most of the employees must have participated in fewer than four of the scheduled events.

Answer:
All of the swim team members who had decreased their racing times during the season were given awards that no other members were given. Since fewer than half the team members were given such awards, the racing times of more than half the team members must have increased during the season.

I can see the flaw in the answer: not decrease not equal to increase. Hi now I see the flaw, "more than four", those participated 4 not eligible, so should not say "fewer than four"

duijinxiaoziUID: 2585955

在lsat中，
hot的逻辑反义不是cold，而是 “非hot”，包括不冷不热。
“more than four”的逻辑反义是 “非 more than four” ，即“fewer than  or equal to  four”