SOLUTION: Is there an easy way to memorize the formulas for geometric and arithmetic series & sequences and to figure out a specific term?
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Question 874159: Is there an easy way to memorize the formulas for geometric and arithmetic series & sequences and to figure out a specific term? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! It helps if you understand what they mean and have used them a few times.
Arithmetic
if you know the last term use S = ½(a + an)n
S = ½(2a + (n-1)d)n
an = a + (n - 1)d
