Study the following information and answer the questions given below.
(i) ′P÷Q′ means 'Q is the father of P'.
(ii) ′P×Q′means 'P is the sister of Q'.
(iii) ′P+Q′ means 'P is the brother of Q'.
(v) ′P−Q′ means 'Q is the mother of P'.
Which of the following is/are redundant to answer the above question?