In a Line
There are 4 students in a line, two 9th Graders and two 10th graders. Each grade has 1 boy and 1 girl. 1 and 2 represent the 9th Graders where 1 is the boy and 2 is the girl. 3 and 4 represent the 10th Graders where 3 is the boy and 4 is the girl. The following were observed :
- There is a boy at the leftmost of the line
- Two 10th Graders are not next to each other
- Two Girls are next to each other
- 4 is at the rightmost of the line
- If 1 is the leftmost then 3 is not in front or at the back of 2
Find the arrangement of the students from lest to right.
The answer is 3124.
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1 solution
There are only 2 possibilities, Using 1st four points 3 1 2 4 & 1 3 2 4.
1 3 2 4 is eliminated because of 5th point