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OpenStudy (anonymous):
Figure 1 has 1 triangle , figure 2 has 3 triangles added , figure 3 has 5 triangles added , figure 4 has 7 trianlges added , what is the formula to find out which figure will have 81 triangles
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OpenStudy (anonymous):
nevermind figure 9 because 9*9 is 81
OpenStudy (anonymous):
#of triangles =#of figure ^2, the answer is 9
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