Step 1: Locate the number.
In the first paragraph, the last sentence gives the total result of the mathematical table made by Varahamihira.
Step 2: Read it.
It says that the table resulted in 1820 combinations of the basic scents.
Step 3: Compare with the options.
Option 1 shows 2020, option 2 shows 1920 and option 3 shows 1620. Only option 4 shows 1820.
Step 4: Answer.
The figure in the passage matches option 4.
Step 5: Second check.
We can also see why the number 1820 is believable. Varahamihira's table works like Pascal's triangle, where numbers are built by adding the numbers above. Such a table can give a large count of mixes from a few base scents. The passage gives the exact total, and the count must be copied from it, so the answer is option 4 and not a nearby number.
Final Answer:
1820 combinations, option 4.
\[\boxed{\text{Option 4}}\]
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