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binary

Discussion in 'A+' started by joker001, Aug 9, 2006.

  1. joker001

    joker001 Bit Poster

    27
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    Ive just watched a video about the A+. when it came to the binary maths bit. it said it uses 1 2 4 8 16 32 64 but correct me if Im wrong but I thought it went up to 128 as in 8 bits not 7

    Am I right or wrong ?
     
    WIP: A+
  2. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    yes you are right... 8 bits is correct...
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  3. The_Geek

    The_Geek Megabyte Poster

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    You are correct:

    128 64 32 16 8 4 2 1
     
    Certifications: CompTIA and Micro$oft
    WIP: PDI+
  4. r.h.lee

    r.h.lee Gigabyte Poster

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    joker001,

    You're correct if we're using an 8 bit word without high bit negation.

    8 bit word without high bit negation:
    • Can have a binary value from 00000000 to 111111111.
    • This corresponds to a decimal range of 0 to 255.
    • Binary 00001010 is decimal 10.
    • Binary 10001010 is decimal 138.
    8 bit word with high bit negation:
    • Can have a binary value from 11111111 to 01111111.
    • This corresponds to a decimal range of -127 to 127.
    • Binary 00001010 is decimal 10.
    • Binary 10001010 is decimal -10.

    I think the reason the A+ video stopped at 64 is because if they did go to 128, then the video would be longer and thus more expensive to produce. So 1->64 may be "enough" according to their lesson plan to teach binary.
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  5. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    In fact the series goes on forever. I suspect that 64 was just a convenient place to stop!

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  6. steveh2001

    steveh2001 Byte Poster

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    And then they would need to provide us a calculator in the exam:D :blink
     
    Certifications: A+,N+,CommVault,MCSA/MCSE 2003,VCP 4.1.
    WIP: ?
  7. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Not really - the trick is to write down the progression on the paper you are supplied with when you start the exam. As each value is double the last this *should* be trivial.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+

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