MATHEMATICAL KANGAROO 2017 | Adding whole numbers of a chart

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Peru ALFRAM
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Published on ● Video Link: https://www.youtube.com/watch?v=-IzdO1cVyL4


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Every box shows the result of the addition of the numbers on the very left and on the very top (for example: 5 + 7 = 12).
Which number is written behind the star?
10
11
12
13
15



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