Mathematics...

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Across
  1. 5. there are two types of decimal no. Under this
  2. 6. how many no. Lie b/w 2 rational no.
  3. 7. The positive integers excluding 0
Down
  1. 1. can be written in p/q form
  2. 2. finite no. Of digits after decimal
  3. 3. the positive numbers including 0
  4. 4. contains set of positive and negative no.