katiebugg
a1 = 5, an = 3, n = 20



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amistre64
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baking cupcakes are you?

katiebugg
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no

katiebugg
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find the sum of the arithmetic sequence having the data given.

amistre64
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oh, thats doable then, use the formula:
\[\frac n2(a1+an)\]

katiebugg
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thanks!