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A G 7 8

sethoflagos
in Brain Teasers and Puzzles

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Apologies to anyone whose already seen this.

The title represents four cards, each of which is known with certainty to have a letter on one side and a numerical digit on the other.

Which card(s) must one turn over to confirm that the set is compatible with the statement "All cards with an A on one side have a 7 on the other"?

Please hide answers and reasons, and mention if you've seen it before.

Easy peazy lemon undifficult

Seems straightforward - only two cards can invalidate "All cards with an A on one side have a 7 on the other" and that's the A card and the 8 card.

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