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Verified answer
A=2b=2
S8=½.8(2.2+7.2)
=4.18=72
a=2
r=u2/u1
=4/2
=2
S8=a(r^n)-1/r-1
=2(2^7)-1/2-1
=2·128-1/1
=256-1
=255