Study the following information carefuJJy and answer the questions given below :
(i) 'S`xx` T' means 'S is the brother of T'
(ii) 'S `div` T means 'T is the father of S'.
(iii) 'S + T' means 'S is the sister of T'.
(iv) 'S - T' means 'S is the mother of T'.

Which of the following statement is/are superfluous to answer the above question ?

Options

A. (i) only
B. (ii) only
C. (iii) only
D. Both (i) and (ii)

Answer

D

Explanation

No equation in the above question consists of the signs .+. and .-..
So, Only (i) and (ii) are required or used to answer the above question.
Therefore, only (iii) and (iv) are superfluous i.e not used or not required to answer the above question