Which one of the following must be true?

MayaM on August 17, 2022

Confused

Can someone explain this one please?

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Emil-Kunkin on August 21, 2022

Hi MayaM,

Our third rule tells us that wither W or Z must not be selected, it is impossible that both W and Z are in. Lets look at what would happen if X and Y are both not selected.

In:
Out: X, Y

Since we know that we must have at least two of the topaz stones in, we know that we have W and Z in

In: W, Z
Out: X, Y

Since we know that W and Z cannot both be in, it is impossible that X and Y are both out, so the answer is D.