CA Foundation · Quantitative Aptitude · Blood Relations
In a code, 'A + B' means 'A is the mother of B', 'A − B' means 'A is the father of B', and 'A × B' means 'A is the sister of B'. Which expression shows that P is the grandfather of S?
The expression P − Q × R + S is correct. P is the father of Q, Q is R's sister, so P is also R's father, and R is the mother of S. This makes P the grandfather of S.
- AP × Q − R + S
- BP + Q − R × S
- CP − Q × R + SCorrect
- DP − Q + R − S
Explanation
P − Q × R + S: P is the father of Q, Q is the sister of R, and R is the mother of S. So P is also R's father and therefore S's grandfather. P × Q − R + S makes P female, an aunt. P + Q − R × S makes P a grandmother. P − Q + R − S makes P a great-grandfather.
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