RE: How many triangles are located in the image? The simple test which astonished the users of a social networks.

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How many triangles are located in the image? The simple test which astonished the users of a social networks.

in math •  7 years ago 

24 since there's (3 choose 2 = 6) triangles for the top part and then that times 4 for the ability to extend that down 1,2,3, or 4 rows.

math
7 years ago by

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