Patterns AB ABB ABC — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Sun, moon, sun, ___, sun, moon. What is missing?
A) moon
B) star
C) sun
D) cloud
AB pattern alternates sun and moon, so moon fills the gap on spot four.
2. In the AABB pattern red, red, blue, blue, what is the 7th item?
A) blue
B) red
C) yellow
D) green
AABB pattern repeats every four spots, so spot 7 lands on red again.
3. Which row breaks the ABB pattern?
A) red, blue, blue, red, blue, blue
B) A, B, B, A, B, B
C) red, blue, red, blue, blue
D) 1, 2, 2, 1, 2, 2
The third choice mixes AB and ABB rules, while the others stay true to ABB.
4. In the ABC pattern X, Y, Z, X, Y, Z, what is the 9th item?
A) X
B) Y
C) W
D) Z
ABC pattern places Z on every third spot, so item 9 is the letter Z.
Part B: Fill in the Blank
Write the correct answer on each line.
1. apple, banana, apple, banana, apple, banana
AB pattern alternates apple and banana, so banana fills the empty fourth spot.
2. In A, B, B, A, B, B, the 9th item is B
ABB pattern places B on spot 9 since A lands on spot 7 each cycle.
3. red, blue, yellow, red, blue, yellow, red, blue, yellow
ABC pattern uses red, blue, yellow, so blue completes the second loop here.
4. In the AB pattern star, moon, star, moon, the 12th item is moon
AB pattern puts moon on even spots, so the 12th item is moon.
5. 1, 1, 2, 2, 1, 1, 2, 2, 1, 1
AABB pattern groups two 1s and two 2s, so 1 follows the new 1.