Hint to Riddle #80: Four Cards A, D, 3 & 6

80. Suppose I give you four cards labelled with the letters A and D and the numerals 3 and 6. The rule of the game is that a card with a vowel on it always has an even number on the other side.

Which of the cards would you have to turn over to prove this rule to be true?
some playing cards with letters and numbers on one side A, D, 3 & 6 You have to turn over two cards.

The question is which. The first is obvious, the second maybe less so.

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