2
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Which of these tiles would fit the sequence? I've tried to think about it but I have no idea.

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Here is the answer:
if you cancel out item from left side to right hand side you can get remaining value.
you can go any way vertically or horizontally.
In this I am canceling item vertically.

enter image description here

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8
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If you assign positive numbers to squares on the left of the bar and negative numbers to squares on the right and using B for black and W for white, you get the following:

$(1B+3W)+(1B-2W)=(2B+1W)$
$(1B-3W)+(2W-1B)=(-1W)$
$(2B)+(0)=(2B)$

So the solution should be the top right image.

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