Permutation

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Across
  1. 2. value of n if (n+13)p2=240
  2. 3. value of 11P5
  3. 4. value of n if np2=132
  4. 5. value of n if np1=11
  5. 6. value of r if 13pr=156
  6. 8. value of 15P10
  7. 9. value of 13p7
Down
  1. 1. value of 19p9
  2. 7. 20P3
  3. 10. value of r if 16pr=5765760