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Mathematics
Number Theory
Geometric Numbers
What is the sum of the 3rd triangular, 4th square, 5th pentagonal, 6th hexagonal, 7th heptagonal and 8th octagonal numbers?
1 answer
no idea. But you can look up these lists online with little trouble.
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Use the image to answer the question.
An illustration shows a 15 by 12 grid with 4 triangles and a parallelogram on it. Figure 1
