Which of the following correspond to x,y and z. respectively in the following square where sum of elements in each column, row, and diagonal is the same?

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Solution :
Summing the row and comparing total
Choosing the option no.(b)  (18,15,12)
16 + 11 + 18 = 45
17 + 15 + 13 = 45
12 + 19 + 14 = 45
Hence all condition satisfied 
Thus the correct answer is option (b) (18,15,12)