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a(1)=1
a(n)=1024
q=2
a(n)=a(1)*(q^n-1)
1024=1*(2^n-1)
2^10=2^n-1
10=n-1
n=11
S(11)=1*((2^11)-1)/(2-1)
S(11)=2048-1=2047
a(n)=1024
q=2
a(n)=a(1)*(q^n-1)
1024=1*(2^n-1)
2^10=2^n-1
10=n-1
n=11
S(11)=1*((2^11)-1)/(2-1)
S(11)=2048-1=2047
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