Question : For what value of N, 270N will be a perfect square, where 270N is a 4-digit number?
Option 1: 1
Option 2: 6
Option 3: 4
Option 4: 9
Correct Answer: 4
Solution : 270N is a 4-digit number. A perfect square between 2700–2709 is 52 2 = 2704 $\therefore$ N = 4 Hence, the correct answer is 4.
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