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Find the missing number.

   17   |   8   |   5   |   5
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   20   |   4   |   6   |   4   
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   18   |   3   |   7   |   3   
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    7   |   ?   |   8   |   2

Source: This question is taken from YTU YOS 2018 exam. I have mentioned those exams in my other posts.

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1 Answer 1

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9. First + second = third * fourth

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