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(73)10 = (1 0 0 1 0 0 1)2
73 written in base 2 is... 1001001
10 base 2 = 2 base 10
11011 base 2 is equal to 27 in base 10 321 base 4 is equal to 57 in base 10 27+57=84
Adding in base 2 is binary for computers. 10 = 2 because 10 means 1 of your base. The rules are no different.