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r = -4/-2 = 2
Sn = a(r^n - 1)/r - 1
S8 = -2(2^8 - 1)/2-1
= -2(256 - 1)
= -2(255
= -510
r=U2/ U1 = -4/-2= 2
Sn = a (rn – 1)/ r-1
= -2( 28 -1)/2-1
=-2 (256-1)
=-2x 255
- -510