DrewMutzig
DrewMutzig
26-07-2017
Mathematics
contestada
Find S7 for 3 + 8 + 13 + 18 +…
Respuesta :
hanima
hanima
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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