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Stage #of triangles

1 1
2 3
3 6
4 10
How many Traingles will the nTH stage contain?
F.2^n-1
G.n^2+n/2
H.2n-1
J.n^2+2/2

1 answer

  1. none of the answers are correct
    the correct answer would be (n^2 + n)/2

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