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Sn=½n(2a+(n-1)b)
306=½n(2.2+(n-1)2)
306=½n(4+2n-2)
306=½n(2n+2)
306=n(n+1)
n²+n-306=0
(n+18)(n-17)=0
n=17
S12=12/2(2.2+(11.2))
S12=6(4+22)
S12=6(26)
S12=156
S17-S12=306-156=150
Jadi Jumlah 5 bilangan terakhir adalah 150
atau 26+28+30+32+34=150