11.  


4
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7


Answer

 Option

Starting with the numbers in the top row, and following straight lines through the centre of the diagram, subtract the middle number from the top number to give the corresponding value on the bottom row.

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12.  


4
6
8
10


Answer

 Option

In each star diagram, the number in the centre equals the sum of the top three numbers, subtracting the sum of the bottom two numbers.

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13.  


4
5
6
7


Answer

 Option

Numbers in the lower left circle equal the sum of the numbers in corresponding segments of the top two circles, and numbers in the lower right circle equal the difference of the numbers in corresponding segments of the top two circles.

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14.  


4
5
6
7


Answer

 Option

In each triangle, the central number equals the sum of the three outer numbers divided by two.

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15.  


4
5
6
7


Answer

 Option

In each star, the central number equals the difference between the sum of the even numbers and the sum of the odd numbers from the points of the star.

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