gldenps574 gldenps574
  • 03-01-2018
  • Mathematics
contestada

Given 6 terms what is the sum of 10+25+40+...+85

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anchitthawi
anchitthawi anchitthawi
  • 03-01-2018
Sn = n/2 ( a1+an)
= 6/2 (10+85)
= 3 (95)
= 285
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