7
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What number should be put instead of '?'?

 9    4    3     3  

26    8    6    22  

28    ?    7    21
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22
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Answer is

7

As, the recipe to find the missing number is

Multiply 2nd term , 3rd term and then subtract 4th term to get the first term

That Is, for example

26 = (8×6) - 22.

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