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The coefficient of x 301 in (1 + x ) 500 + x (1 + x ) 499 + x 2 (1 + x ) 498 + .... .. + x 500 is

1. 501 C 302
2. 501 C 200
3. 500 C 300
4. 500 C 301

Correct answer: 501 C 200

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