Sn=((a1 + an)/2)*n
an=a1+(n-1)d
d=an-a(n-1)= 6-4=2
6=2+(n-1)*2=3
Sn=((2+6)/2)*3=12
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Sn=((a1 + an)/2)*n
an=a1+(n-1)d
d=an-a(n-1)= 6-4=2
6=2+(n-1)*2=3
Sn=((2+6)/2)*3=12