Question

Восемь мальчиков выстроились в колонну друг за другом так, что А стоял перед Б и В, Б - после К через одного; Л - перед А, но после Д, В - после М через одного, Д - между Б и Г, М - после К, но перед В. Кто стоял пятым по счету в колонне, считая от головы колонны?

Answer 1

Г Д Л А (К) Б М В. Не уверен точно!

Answer 2

Problem Analysis

We are given a sequence of eight boys standing in a column. The following conditions are given: - A is standing in front of B and C. - B is standing after K, with one person in between. - L is standing in front of A but after D. - V is standing after M, with one person in between. - D is standing between B and G. - M is standing after K but in front of V.

We need to determine who is standing fifth in the column, counting from the head.

Solution

To solve this problem, let's analyze the given conditions step by step and determine the position of each boy.

1. A is standing in front of B and C. - From this condition, we can conclude that A is at the front of the column, followed by B and C.

2. B is standing after K, with one person in between. - Since B is after K with one person in between, the possible positions for B and K are: - B K _ _ _ _ _ - _ B K _ _ _ _ - _ _ B K _ _ _ - _ _ _ B K _ _ - _ _ _ _ B K _ - _ _ _ _ _ B K - We can see that B and K can only be in the 2nd and 3rd positions, respectively.

3. L is standing in front of A but after D. - From this condition, we can conclude that L is after D and before A.

4. V is standing after M, with one person in between. - Since V is after M with one person in between, the possible positions for V and M are: - _ _ _ _ M V _ - _ _ _ _ _ M V - We can see that V and M can only be in the 6th and 7th positions, respectively.

5. D is standing between B and G. - From this condition, we can conclude that D is between B and G.

6. M is standing after K but in front of V. - From this condition, we can conclude that M is after K and before V.

Based on the above analysis, we can determine the positions of each boy as follows: 1. A 2. B 3. K 4. G 5. D 6. L 7. M 8. V

Therefore, the boy standing fifth in the column, counting from the head, is D.

Answer

The boy standing fifth in the column, counting from the head, is D.