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     EduGorilla 
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    If the sum of odd terms in the expansion (x + a)n is A and the sum of even terms is B, then

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    1. AB = 1/4 (x - a)2n - (x + a)2n
    2. 2AB = (x + a)2n - (x - a)2n
    3. 4AB = (x + a)2n - (x - a)2n
    4. None of these
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