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Convert    1 1 0 1 1 0 1 to decimal


1           1            0           1           1            0             1

(1) * 2^6   (1) * 2^5   (0) * 2^4   (1) * 2^3   (1) * 2^2    (0) * 2^1     (1) * 2^0

64        +      32   +    0      +   8       +   4       +   0        +   1  

= 109