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Mathematics 20 Online
OpenStudy (anonymous):

What is the missing number in the fourth triomino? A. 2 B. 3 C. 9 D. 11 http://static.k12.com/calms_media/media/1419500_1420000/1419686/1/2624ba12ad5d2199f46a2f0cd41341272f9a8d6b/FGA_130923_261527.jpg

OpenStudy (dmndlife24):

B. 3

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