destinyw9619 destinyw9619
  • 21-01-2018
  • Mathematics
contestada

Write a formula for the sum of the first n integers that are divisible by 3

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dannielle
dannielle dannielle
  • 21-01-2018
3*1+3*2+3*3+,,,+3n= 3*(1+2+...+n)
=3*n(n+1)/2


cause 1+2+...+n=n(n+1)/2
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