necolewiggins6435 necolewiggins6435
  • 19-07-2018
  • Mathematics
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Write the sum using sigma notation: 3+6+9+12+⋯+120=∑an=1b.

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sqdancefan
sqdancefan sqdancefan
  • 19-07-2018

Your sum is


[tex]\sum\limits_{n=1}^{40}{(3n)}[/tex]



Each term is a multiple of 3. The first term is 3·1 and the last term is 3·40. Thus for n=1 to 40, the general term is 3n.

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