What is the second number in the row of Pascal's triangle that has 43 numbers?
<|im_start|>system
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<|im_start|>user
What is the second number in the row of Pascal's triangle that has 43 numbers?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
42
What is the second number in the row of Pascal's triangle that has 43 numbers?
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