Answer:
2n
Step-by-step explanation:
Look at the photo below for the details.
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Diameter of circle is known as greatest chord of the circle.
Number of regions created by n unique diameter is 2n.
Diameter of circle is two times of its radius.
By 1 diameter, two region is created in circle
By 2 diameter, 4 region is created in circle.
By 3 diameter , 6 region is created in circle.
Therefore, by n unique diameters, 2n regions is created in circle.
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