Please answer this question.

​Q32. Find the missing number from the given response .
      
     5    9    ?    13
     8    3    1    10
    12    11    5    18

the following pattern is observed

12+11-5=18

8+3-1=10

Following the above pattern
Let the unknown number be x
Therefore,

5+9-x=13
x=14-13
x=1 is the answer

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