The coefficient of
(a) 100 (b) 269 (c) 225 (d) 0
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https://www.meritnation.com/ask-answer/question/the-sum-of-the-coefficients-of-the-first-three-terms-in-t/binomial-theorem/10968875
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https://www.meritnation.com/ask-answer/question/the-sum-of-the-coefficients-of-the-first-three-terms-in-t/binomial-theorem/10968875
Regards.