ShiP680019 ShiP680019
  • 25-10-2022
  • Mathematics
contestada

this is a super hard one

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PlatonS607534 PlatonS607534
  • 25-10-2022

Notice that in the given sequence the difference between the first two terms is 7 so the solution must be in terms of multiples of 7 plus a constant. The only two options that have this characteristic are first and last ones, for the sum to consider the first term the sum must start for r=0.

Answer: last option.

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