517 325 639 841 792 What will be the first digit of the second highest number after the positions of only the 2nd, 3rd digits within each number are interchanged?

8
2
7
9

Correct Answer: 7

Explanation:

The new numbers formed are 571, 352, 693, 814, 729

The second highest number is 729, its first digit is 7

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