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Binary number 1111 1111 is equivalent which decimal number

(1111 1111)2 is equivalent to (?)2

  1. 256
  2. 255
  3. 252
  4. 200

1 Answer


Correct option is B. 

The decimal number is equal to the sum of binary digits (dn) times their power of 2 (2n): decimal = d0×20 + d1×21 + d2×22 + ... 
So, (11111111)2 will be (255)10.
 
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