If 2 is added to each odd digit and 2 is subtracted from each even digit in the number 7213546, which of the following digits will be third from the left in the new number thus formed?
3
Take each digit of 7213546 and apply the rule: odd digit gets \(+2\), even digit gets \(-2\).
7 is odd: \(7 + 2 = 9\).
2 is even: \(2 - 2 = 0\).
1 is odd: \(1 + 2 = 3\).
3 is odd: \(3 + 2 = 5\).
5 is odd: \(5 + 2 = 7\).
4 is even: \(4 - 2 = 2\).
6 is even: \(6 - 2 = 4\).
The new number is 9035724. The digit third from the left is 3.
Hence, the third digit from the left is 3.
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