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10 July, 08:57

What's the formula for sequence when the difference is different?

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  1. 10 July, 09:17
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    If it is first difference, we use : nth term = a1 + (n - 1) d

    If it is 2nd difference, we use : nth term = a + (n - 1) d + ½ (n - 1) (n - 2) c
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