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The nth triangular number, t(n) = n*(n+1)/2
So t(99) = 99*100/2 = 4950
Wiki User
∙ 12y ago
Wiki User
∙ 8y agoThe nth triangular number is n(n+1)/2
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How do you find the 99th number in the sequence 5 8 11 14 17?
The sequence seems to be calculated by f(n) = 3n + 2.3(1) + 2 = 5, 3(2) + 2 = 8, 3(3) + 2 = 11, and so on.Therefore, the 99th term would be 3(99) + 2 = 299
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The sequence seems to be calculated by f(n) = 3n + 2.3(1) + 2 = 5, 3(2) + 2 = 8, 3(3) + 2 = 11, and so on.Therefore, the 99th term would be 3(99) + 2 = 299
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How do you find the area of a triangle on a coordinate plane?
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How do you find an area for a triangle?
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How do you find the area and perimiter of a triangle?
To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle. To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle.
