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If it is possible to make only one such number with the first, the fourth and the sixth digits of the number 531697, which is the perfect square of a two-digit even number, which of the following will be the second digit of the two digit even number. If no such number can be made, give '@' as the answer and if more then one such number can be made, give 'c' as the answer.
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- 4
- 2
- 6
- @
Correct Option: A
5 3 1 6 9 7
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Perfect square = 576
Square root = √576 = 24
Hence, second digit = 4