Question

E + F means E is daughter of F. E - F means E is husband of F. E × F means E is sister of F. E ÷ F means F is father of E. If L + M – N + O × P – Q ÷ R, then which of the following statements is NOT correct?

A R is father-in-law of P.
B N is grandson of R.
C O is grandmother of L.
D M is son-in-law of O.
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