Jawab:

Sara has four possible codes to try: 4362, 4632, 8364, or 8634.

Penjelasan dengan langkah-langkah:

Let's start solving this problem step by step.From clue a, we know that the last digit is 2, 4, or 8.

From clue b, we know that the first digit is double the last digit. Therefore, the first digit must be 4, 8, or 16 (since it's double the last digit). However, since the chest code is a 4-digit number, we need to discard the possibility of the first digit being 16, as it has two digits.

So, the possible values for the first digit are 4 or 8.

From clue c, we know that the sum of the middle two digits is 9 and is a multiple of 3. The only possible values for the middle two digits that satisfy this condition are 36 or 63.

So, we have the following possible codes:

4362

4632

8364

8634

Therefore, Sara has four possible codes to try: 4362, 4632, 8364, or 8634.