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arithmetic and geometric sequences

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by cloodle » Tue Oct 07, 2008 1:12 pm
Hey guys,

Do you really need to know by heart the formulas for nth number and sum for arithmetic and geometric sequences? or will you be given the formula if you're expected to use it?

What would you recommend?

Thanks!
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Source: — Quantitative Reasoning |

by gabriel » Tue Oct 07, 2008 2:49 pm
Yes you would need to know them by heart and they really are not that hard to remember.
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