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d1=6*1-3\1+3=3\4
d2=6*2-3\2+3=9\5
d3=6*3-3\3+3=15\6=2 1\2
4)
a1=5
g=2
a1=5
a2=5*2=10
a3=10*2=20
a4=20*2=40
a5=40*2=80
a6=80*2=160
S6=5+10+20+40+80+160=315
5)
a1=3
r=2
a8=7r=3+7*2=17
S8=a1+an\2*n=3+17\2*8=80
S8=80