Question

If ‘P X Q’ means ‘P is the mother of Q’, ‘P + Q’ means ‘Q is the sister of P’ and ‘P - Q’ means ‘P is the daughter of Q’, then how will ‘A is the aunt of B’ be denoted? (Take A, B and C as three variables)

Answer 1

B-C implies that B is the daughter of C.

C X B implies that C is the mother of B.

A + C implies that A is the sister of C.

Thus, A is the aunt of B.