2(A-1)=2*(1+2^2+2^3+…+2^200)
2A-2=2+2^3+2^4+…+2^200+2^201
2A-2=A+2^201
A=2^201+2
2(A-1)=2*(1+2^2+2^3+…+2^200) 2A-2=2+2^3+2^4+…+2^200+2^201 2A-2=A+2^201 A=2^201+2
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