maths

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Across
  1. 3. product of first n natural numbers
  2. 5. sum of even and odd numbers
  3. 6. no divisible by 1 and itself
  4. 7. figures which have the same shape and size
Down
  1. 1. pi radian
  2. 2. lines which do not have common point
  3. 4. square root of negative no