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Question 130
The coefficient of $$x^{n - 1}$$ in $$(x - 1)(x - 2)(x - 3) ................. (x - n)$$ is
Solution
Consider the most basic case of (x-1)*(x-2)
The co-efficient of $$x^{2-1}=x$$ is -3
We can reject option A and C outright. Option D gives value -1, hence, incorrect.
Only option B gives correct answer.
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