26.  


4
5
6
7


Answer

 Option

Adding up the digits in each oval shape, as you move down the column this total increases by 2 each time, from 12 to 22.

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27.  


39
40
41
42


Answer

 Option

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

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28.  


37
38
39
40


Answer

 Option

Working from top to bottom, double each number and subtract 1, 2, then 3 etc.

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29.  


311
253
312
254


Answer

 Option

Starting at the top left, and moving through the diagram in a Z shape, double each number and add 3 to give the next number along.

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30.  


3
5
7
9


Answer

 Option

Taking the top row of circles, numbers in the central circle equal the sum of the numbers in corresponding segments of the left and right hand circles. In the bottom row, numbers in the central circle equal the difference between numbers in corresponding segments of the left and right hand circles.

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