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Rule out the wrong answers

Exercise and reference answers

Questions
  1. Question
    A fully connected mesh of n nodes needs this many wires.
    Choices
    1. Item
      n(n-1)/2
      Correct
      Yes
    2. Explanation
      The count comes from pairs of nodes, halved.
      Item
      n(n-1)/3
      Correct
      No
    3. Explanation
      Each node links to n-1 others, not n-2.
      Item
      n(n-2)/2
      Correct
      No
    4. Explanation
      No node links to itself, so n+1 is too many.
      Item
      n(n+1)/3
      Correct
      No
  2. Question
    Modem is short for these two words.
    Choices
    1. Item
      Modulator demodulator
      Correct
      Yes
    2. Explanation
      The device modulates and demodulates signals.
      Item
      Modular demodular
      Correct
      No
    3. Explanation
      That simply repeats the abbreviation.
      Item
      Modem demodem
      Correct
      No
    4. Explanation
      A modem is not a monitor or a decoder.
      Item
      Monitor decoder
      Correct
      No
Instructions
Remove the three wrong options and leave the right one.

Explanation

_Source: syllabus Computer Science, Ch 10 'Computer Networks'_
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