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 Post subject: AE Tuition Book 2, helpPosted: Sat Nov 15, 2008 5:27 pm

Joined: Mon Jun 16, 2008 5:34 pm
Posts: 548

Please can you help with Chapter 13 Revision Section 6, Question 9:
(Matrix)

I can understand everything except why the grey square has a black square in it. (d)

Why cant the white square have a black square in it?, ie why cant the answer be b?

Thanks!

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 Post subject: Posted: Sat Nov 15, 2008 8:06 pm

Joined: Tue Sep 16, 2008 7:30 pm
Posts: 139
Hi JaysDarlin,

Here is my take on this.

Each shape has two parts.
Top part has a white small square and bottom part has a dark square.
In each row, the shapes move one column forward.
When a shape drops off at the end, it re-emerges in the first column next row with its dark fill moved to the other half.

So, in the third row, as the shape with the grey top drops off from the second row and re-emerges in the first column of the third row, the bottom dark fill moves up and that exposes its dark small square.

Hope this helps.

Gilly

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 Post subject: Posted: Sat Nov 15, 2008 9:39 pm

Joined: Mon Jun 16, 2008 5:34 pm
Posts: 548
Gilly, Im totally lost.

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 Post subject: Posted: Sat Nov 15, 2008 10:34 pm

Joined: Tue Sep 16, 2008 7:30 pm
Posts: 139
Ok, take 2...

Quote:
I can understand everything except why the grey square has a black square in it.

Because each shape has a white small square at the top half and a black small square at the bottom half.

Quote:
Why cant the white square have a black square in it?, ie why cant the answer be b?

Because it has to be a shape with the grey fill inside.

If you look at the last item in the second row, it is a shape with the grey fill inside the top half. As the shapes move right by one column, this grey shape drops off from the second row. It then starts at the first column of the third row with a 'transformation'. This transformation is - black fill moves to the top half and the grey fill moves to the bottom half. (This 'transformation' logic can be verified with the behaviour of the shape in the last column of the first row as well).

Also note that the black fill overlaps the entire half where as the white and grey fills expose the inner small square in their halves.

I am sorry if I made it too complicated .

Hoping that we can hear simpler logic to solve this from others in this forum.

Gilly

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