1, 4, 9, 16, 25, 36
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4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
There are no square numbers between 40 & 48. 62 = 36 72 = 49
1, 4, 9, 16, 25, 36
sqrt(30)= 5.5 approx sqrt(40) = 6.3 approx The integer 6 is between the square roots. So the square of 6, which is a perfect square, will be between the two original numbers. So answer is 62 = 36.
-39