Guess the number from the clues:
1) It is a 5-digit number.
2) It has the smallest odd number at all odd places.
3) The sum of all its digits is 10.

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• A 12151
• B 21511
• C 11152
• D 51211

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Answer: A. 12151

The smallest odd number is 1, so the 1st, 3rd and 5th digits are 1. Only 12151 fits this, and 1 + 2 + 1 + 5 + 1 = 10.

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