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3.	Fill in the empty box?

Answer

Ans = 14. Starting on the left on the first group and moving up and down towards the right, numbers increase by 2 and 3. In the second group by 3 and 4 and in the third group by 4 and 5.

4.	Which number goes in the empty box?

Answer

Ans = 3. The numbers in each row add up to 21.