How many numbers are in the first $20$ rows of Pascal's Triangle (from the $0$th row to the $19$th row)?
Question:
How many numbers are in the first $20$ rows of Pascal's Triangle (from the $0$th row to the $19$th row)?
Answer:
Let's think step by step.

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210
How many numbers are in the first $20$ rows of Pascal's Triangle (from the $0$th row to the $19$th row)?
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