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For figure n, shaded triangles = (n+1)x(n+1), unshaded triangles = 2n + 1

(a) For figure 4, shaded triangles = 25, unshaded triangles = 9

(b) 23

(c)

63 unshaded triangles -> n = 31

shaded triangles = 32 x 32 = 1024

total number of triangles = 1087

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