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You see combinations of geometric objects from a circle, a triangle, a square, a rectangle and a diamond and corresponding them numbers $4, 6, 19, 190, 1900$.

Question Can you define the number for the bottom row?

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I think the answer is

2021

Reasoning

Each shape represents a Roman numeral

Circle is I,
Triangle is V,
Square is X,
Long Rectangle is C,
Diamond is M.

So the last sequence represents MMXXI which is 2021.

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