Which one of the following must be true?

Irina on August 31, 2019

@HananFrancis,

The game requires us to determine the order of 6 skydivers - L O P T W Z.

___ ___ ___ ___ ___ ___
1 2 3 4 5 6

The following rules apply:

(1) T dives at some point before W

T > W

___ ___ ___ ___ ___ ___
1 2 3 4 5 6
~W ~T


(2) L dives either first or last

/L /L
___ ___ ___ ___ ___ ___
1 2 3 4 5 6

(3)Neither W nor Z dives from the plane last

___ ___ ___ ___ ___ ___
1 2 3 4 5 6
~W ~T ~T
~W
~Z

This rule also tells us that T cannot be #5, since T > W per rule (1)

(4) P dives at some time after either O or L but not both

O > P

v

L > P

This rule tells us that P cannot be #1

/L /L
___ ___ ___ ___ ___ ___
1 2 3 4 5 6
~W ~T ~T
~P ~W
~Z

We can also infer that if L is #1, P must dive before O, and if L is #6, P must dive after O.

The question asks us which of the following MUST be true.

We can see from our initial setup that T cannot be #5 or #6 because T> W and W cannot be #6. Thus, we can conclude that the latest T could jump is #4 and at least two of the members must drive after T - skydiver #5 and #6 per answer choice (D).

Let me know if you have any further questions.