DrewMutzig DrewMutzig

26-07-2017
Mathematics

contestada

Find S7 for 3 + 8 + 13 + 18 +…

Respuesta :

26-07-2017

a= 3
d= 8-3
=5

S7=n/2[2a+(n-1)d]

S7=7/2[2(3)+(7-1)5]

S7=3.5(6+30)
=126

sorry if im wrong

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