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The sum of coefficients of integral powers of x in the binomial expansion of 50 ) x 2 1 ( − is :

1. 2 1 (3 50 + 1)
2. 2 1 (3 50 )
3. 2 1 (3 50 – 1)
4. 2 1 (2 50 + 1)

Correct answer: 2 1 (3 50 + 1)

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