Question: One of the factors of 20pq^2 + 4pq + 45pr^2 − 60pqr − 6rp is :

  Option 1: 15p − 10r + 2
  Option 2: 2r − 3q
  Option 3: 2q − 3r
  Option 4: 10p − 15r + 2
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