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Which of the following diagrams shows the correct relationship among the three terms - Women, Sisters, Mothers ?

  • A.Two separate small circles inside a large circle
  • B.Two overlapping circles inside a large circle
  • C.Three concentric circles
  • D.A small circle inside a large circle and a third circle outside it

Answer: B

The correct diagram is (B): two overlapping circles inside a large circle.

Sisters and mothers are both women, so both circles lie inside the circle for women. The two groups overlap, because some women are both sisters and mothers, some sisters are not mothers, and some mothers are not sisters (a woman with no siblings who has children).

(A) keeps sisters and mothers apart, as if no woman could be both. (C) nests one group wholly inside the other, as if every mother were a sister. (D) puts one group outside the women altogether, which is impossible since every sister and every mother is a woman.

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