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Go to the line item's Settings tab.
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Under "Adjust delivery", select one of the following Rotate creatives options:
- Evenly: Each creative is displayed equally at random.
- Optimized: Creative with the highest CTR displays more often.
- Weighted: Creatives displayed at a frequency you define.
- Sequential: Creatives display to each user in the order you specify.
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Click Save.
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Go to 'creatives' tab
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For creatives SOV, Change the weight on 'weight' column
Read more at Google docs here