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 Can someone please help me ASAP? I can only take this once

 Jan 27, 2020
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Use arithmetic sequence sum formula we get that the sum formula we get that 3+6+9+12+15=45. Thus, the summation is 45. Sorry if the explanation wasn't concise enough. I'm only 12 and rlly bad at explaining stuff.

 Jan 27, 2020

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