gldenps574 gldenps574

03-01-2018
Mathematics

contestada

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

Respuesta :

anchitthawi anchitthawi

03-01-2018

Sn = n/2 ( a1+an)
= 6/2 (10+85)
= 3 (95)
= 285

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