title: Hexadecimal Number corresponding to 4 Bit
body: <p>I am wondering why a hexadecimal number corresponds to 4 Bits of memory. 
  My thinking is that:</p>
  
  <p>HEX = 16 digits --> So you need 16 possible combinations therefore 4 bits as they offer you 16 possible combinations --> 2^4</p>
  
  <p>BInary = 2 digits --> 2 possible combinations so 1 bit is enough as 1 bit offers 2 possible combinations</p>
  
  <p>Decimal --> Decimal would then require 5 bits, correct? As you need 10 possible combinations, therefore 5 bits. </p>
  
  <p>Please verify if my thinking is correct, especially with the HEX and Decimal. </p>
  
  <p>Thanks</p>