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      arithmetic - quiz on simple arithmetic


      arithmetic [-o +-x/] [-r range]


      arithmetic asks you to solve problems in simple arithmetic.  Each ques‐
      tion must be answered correctly before going on to the next.  After every
      20 problems, it prints the score so far and the time taken.  You can quit
      at any time by typing the interrupt or end-of-file character.
      The options are as follows:
      -o      By default, arithmetic asks questions on addition of numbers from
              0 to 10, and corresponding subtraction.  By supplying one or more
              of the characters +-x/, you can ask for problems in addition,
              subtraction, multiplication, and division, respectively.  If you
              give one of these characters more than once, that kind of problem
              will be asked correspondingly more often.
      -r      If a range is supplied, arithmetic selects the numbers in its
              problems in the following way.  For addition and multiplication,
              the numbers to be added or multiplied are between 0 and range,
              inclusive.  For subtraction and division, both the required
              result and the number to divide by or subtract will be between 0
              and range.  (Of course, arithmetic will not ask you to divide by
              0.)  The default is 10.
      When you get a problem wrong, arithmetic will remember the numbers
      involved, and will tend to select those numbers more often than others,
      in problems of the same sort.  Eventually it will forgive and forget.
      arithmetic cannot be persuaded to tell you the right answer.  You must
      work it out for yourself.


      “What?” if you get a question wrong.  “Right!” if you get it right.
      “Please type a number.” if arithmetic doesn’t understand what you typed.


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