Question 20
How many children are in Jone’s family if each child has at least one brother and at least one sister?
Editorial task: determine what the condition actually forces. Prove the minimum and test whether the exact total is determined.
Original source options (retained):
(A) 2; (B) 3; (C) 4; (D) 5; (E) 6
Editorial format note: this essay examines the source wording and its assumptions. The original choices are retained for comparison.
Editorial task: determine what the condition actually forces. Prove the minimum and test whether the exact total is determined.
Original source options (retained):
(A) 2; (B) 3; (C) 4; (D) 5; (E) 6
Editorial format note: this essay examines the source wording and its assumptions. The original choices are retained for comparison.