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Answer is 51

there are simple methods to slove this puzzle

Answer is 51 and here is my method:

First, 2nd and 3rd row elements are multiplied I.e. 7x4, 5x8, 6x9

Then we will subtract result of multiplication with the corresponding 1st row element i.e.

7x4 - 1 = 28 - 1 = 27

5x8 - 2 = 40 - 2 = 38

6x9 - 3 = 54 - 3 = 51 is the Answer.

4*7=28-1=27
5*8=40-2=38

6

*9=54-3=51*

So, answer is 69=54-3=51

So, answer is 6