31.  


29
36
45
51


Answer

 Option

Moving to the right, double each number and subtract 3 to give the next number along.

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32.  


21
23
25
27


Answer

 Option

Starting top left, and moving down in columns from left to right, the numbers follow the sequence of prime numbers from 2 to 23.

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33.  


20
22
24
26


Answer

 Option

In each circle, the lower number equals the product of the top two numbers, subtracting 3 for the left hand circle, 4 for the middle, and 5 for the right hand circle.

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34.  


2
3
4
5


Answer

 Option

Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining.

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35.  


2
4
6
8


Answer

 Option

On each row, add the values of the left hand and central boxes to give the value in the right hand box.

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