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In the number 7965843247, if the first half of the digits are decreased by 1 and the remaining digits are increased by 1, what is the sum of the 3rd, 5th, and 9th digits from the left end?

1. 14
2. 17
3. 23
4. 15

Correct answer: 17

Solution

The first five digits are reduced by 1 and the remaining five digits are increased by 1. After the transformation, the 3rd, 5th, and 9th digits are identified and added to get 17.

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