6.  


4
5
6
7


Answer

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Working in columns, the sum of the numbers in each column is always 14.

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7.  


4
5
6
7


Answer

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The numbers in each row and column add up to 15.

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8.  


39
40
41
42


Answer

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Moving from left to right, numbers increase by 2, 3, 4 and 5.

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9.  


9
10
11
12


Answer

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In each square of the diagram, the sum of the numbers is always 22.

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10.  


14
16
17
19


Answer

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Moving clockwise, around alternate segments in the chain, one sequence decreases by 1, 2, 3 and 4 each time, while the other increases by 2, 3, 4 and 5.

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