Instructions

Given that A = {n : n prime, $$1 \leq n \leq 20$$}
                  B = {n : n odd, $$1 \leq n \leq 20$$}
   and        C = {n : n square, $$1 \leq n \leq 20$$}.
Using this answer the questions

Question 55

The number of integers between 1 and 20 which do not lie in $$A \cup B \cup C$$ is

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