0
nth term can be calculated from the formula (n - 1) x n/2.
Eg 8th term = 7 x 4 ie 28; 42nd term = 41 x 21 ie 861.
If the series starts at 1 rather than 0, the formula is (n + 1) x n/2
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A:
(n2-n) ÷ 2
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∙ 11y ago
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