Arithmetrick

2006 Aug 30

Give your answer quickly - and without using pen or pencil. Which sum is the greater, that of the figures on the left, or on the right?

987654321      123456789
 87654321      12345678
  7654321      1234567
   654321      123456
    54321      12345
     4321      1234
      321      123
       21      12
        1      1
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