is the following expression correct? i mean it's logical to me but i'm not sure if you can do this:

tn = tn-1 + 1 + n

Another way of doing it I think could be by looking into quadratics, but i don't want it to be very complicated.

is the following expression correct? i mean it's logical to me but i'm not sure if you can do this:

tn = tn-1 + 1 + n

Another way of doing it I think could be by looking into quadratics, but i don't want it to be very complicated.

tn = tn-1 + 1 + n

Another way of doing it I think could be by looking into quadratics, but i don't want it to be very complicated.

- stapel_eliz
**Posts:**1686**Joined:**Mon Dec 08, 2008 4:22 pm-
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The differences are 3, 4, 5, 6, and 7, with t_{1} = 7 and the differences leading to t_{n} for n > 1. So your formulation looks good.

However, if you are supposed to get a closed-form, rather than recursive, formula, you will need to use a quadratic. Use the method explained**here**.

However, if you are supposed to get a closed-form, rather than recursive, formula, you will need to use a quadratic. Use the method explained