Multiple choice general knowledge

In which book was Professor Calculus introduced?

  1. Red Rackham's Treasure

  2. Explorers on the Moon

  3. Destination Moon

  4. The Calculus Affair
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A Correct answer
Explanation

Professor Calculus (Professeur Tournesol in French) was first introduced in 'Red Rackham's Treasure' (1944). This adventure follows 'The Secret of the Unicorn' and features the treasure hunt where Calculus's inventions prove crucial. The other options are later adventures where he appears.

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