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Tanstalas on 11 January 2011
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16 8 4 2 1 = 31

Binary is fairly simple

 

11111111

128 / 64 / 32 / 16 / 8 / 4 / 2 / 1

If it is a 1 then you add the number if it is a 0 you dont

so 

1111 = 8 4 2 1 = 15

1101 = 8 4 0 1 = 13

This has been your useless lesson for the day



Unicorns ARE real - They are just fat, grey and called Rhinos