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Jadi
Sn = a(r^(n)-1)/r-1
S10 = 2(2^(10)-1)2-1
S10 = 2(1024-1)/1
S10 = 2046
r = 2
Sn = a( 1 - ) / ( 1 - r )
S10 = 2( 1 - ) / ( 1 - 2 )
S10 = 2 ( 1 - 1024 ) / -1
= 2 - 2048 / -1
= - 2046 / -1
= 2046