Which digit appears in the tens place of the second largest 5-digit number formed using 1, 5 and 7, where each digit is used at least once?

Answer: C. 1

The second largest 5-digit number using 1, 5, and 7 is 77715.
To be the largest, we start with three 7s followed by the next largest digits, 5 then 1 (77751).
The next highest arrangement keeps the three 7s but swaps the last two digits to 1 then 5.
In the resulting number 77715, the digit 1 occupies the tens place.
Therefore, the correct answer is c) 1.

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