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Sn= a ( r^n - 1) /(r-1)
S9 = 1( 2^9-1) / (2-1)
= (512-1)
= 511
b) r= U2/U1= 1/3
Sn = a ( 1-r^n) / (1-r)
S9 = 54 ( 1-1/3^9 )/ (1-1/3)
= 54 ( 1-19683 ) / 2/3
= - 1062828 /2/3
= - 1594242