Direction In each of the following questions, group the given figures into three classes using each figure only once. -
11.

 A. 3,4,9 ; 5,7,8 ; 1,2,6 B. 1,5,6 ; 2,4,8 ; 3,7,9 C. 4,6,8 ; 3,5,7 ; 1,2,9 D. 1,2,7 ; 3,5,9 ; 4,6,8
Explanation:

1, 2, 7 are simple geometrical figures.

3, 5, 9 have one element placed inside a different element.

4, 6, 8 have two different elements attached to each other.

12.

 A. 1,5,8 ; 3,4,7 ; 2,6,9 B. 1,3,6 ; 4,5,9 ; 2,7,8 C. 1,3,6 ; 2,5,7 ; 4,8,9 D. 6,7,8 ; 1,3,7 ; 2,4,9
Explanation:

1, 3, 6 contain one complete circle each.

2, 5, 7 contain a semi-circle each.

4, 8, 9 contain a triangle each.

13.

 A. 1,3,6 ; 4,5,8 ; 2,7,9 B. 2,3,9 ; 4,5,8 ; 1,6,7 C. 1,6,8 ; 3,7,9 ; 2,4,5 D. 3,8,9 ; 1,2,7 ; 4,5,6
Explanation:

1, 6, 8 are figures composed of straight as well as curved lines.

3, 7, 9 are closed figures shaded by oblique line segments.

2, 4, 5 are figures composed of straight lines only.

14.

 A. 1,2,4 ; 3,5,6 ; 7,8,9 B. 1,7,8 ; 3,5,6 ; 2,4,9 C. 1,3,4 ; 2,8,9 ; 5,6,7 D. 1,7,8 ; 2,3,6 ; 4,5,9
Explanation:

1, 7, 8 are all undivided geometrical figures.

3, 5, 6 are geometrical figures divided into two parts.

2, 4, 9 are geometrical figures divided into four parts.

15.

 A. 1,3,7 ; 2,4,6 ; 5,8,9 B. 1,4,6 ; 2,5,7 ; 3,8,9 C. 1,4,8 ; 2,5,6 ; 3,7,9 D. 1,4,8 ; 2,7,9 ; 3,5,6