If f(x) = x^n, then the value of f(1) - f'(1) 1 + f''(1) 2! - f'''(1) 3! + (-1)^nf^n(1) n! is

JEE Main 2003 Mathematics question

If , then the value of is

Answer: (4)

For , . The expression is

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Question ID VK-038223