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Four cards lie on a table. Each card has a number printed on one side and a colour on the other. The faces visible on the cards are 2, 3, red, and blue.

Proposition: If a card has an even value on one side, then its opposite face is red.

The cards which MUST be turned over to verify the above proposition are
1. 2, red
2. 2, 3, red
3. 2, blue
4. 2, red, blue

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Correct Answer - Option 3 : 2, blue

Faces available on the cards are: 2, 3, red, and blue.

Proposition: If a card has an even value on one side, then its opposite face is red.

We need to check the card with face 2 whether its opposite is red or not. The opposite side will be RED, if the given proposition is TRUE.

No need to check the card with face 3 as it is not even number.

No need to check the card with face red as it can have either even or odd number as its opposite number. (The converse of the given proposition may or may not be true).

We need to check the card with face blue whether its opposite number is even or odd. Its opposite number will be odd, if the given proposition is TRUE.

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