NIACL Model Paper 7 with solutions for free online practice

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 than one such number can be made, give ‘©’ as the answer.