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Addition and subtraction sequences involve the number of elements changing from one box to the next. In an addition sequence, new shapes appear with each step. In a subtraction sequence, shapes disappear. In more complex patterns, both can happen simultaneously — or an element is added while another is removed (replacement).
Sequence:
Next: Five black circles.
What to check: Are the new elements identical to the existing ones, or different?
Often, the new elements are not just added randomly — they appear in specific positions.
Sequence:
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