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And the number is?

What number should replace the question mark below?

6   3   4   6
5   5   7   4
8   3   4   8
3   9   7   ?

 

The Answer Is:

6

Reading down, the sum of the numbers on each row increases by two.

6   3   4   6 = 19
5   5   7   4 = 21
8   3   4   8 = 23
3   9   7   6 = 25

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