Question

Reapeted subtraction of 40

Answer 1

Answer:

40 - 1 = 39

39 - 3 = 36

36 - 5 = 31

31 - 7 = 24

24 - 9 = 15

15 - 11 = 4

4 - 13 = -9

As it is not equal to 0

40 is not a perfect square

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