plzz give answer of this trick..
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In second last one 81 is the square of 9 and if we multiply 7 it comes 63
In the second one we see that 49 is the square of 7 and if we multiply 6 with 7 we get 42
In the first one we see that 64 is the square of 8 and if we multiply 5 with 8 we get 40
So , here we observe that one number is square and another number is not a square so this is the trick used in this .
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