Q:

If L × M means that L is the mother of M, L – M means that L is the father of M, L ÷ M means that L is the sister of M, then which of the following expression shows that P is the father of R?

• 1
  Q – P × R
• 2
  P – Q ÷ R
• 3
  P – Q × R
• 4
  R – P × Q