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     EduGorilla 
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    If coefficient of pth, (p + 1)th and (p + 2)th terms in the expansion of (1 + x)n are in A.P, then 

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    1. n2 - n(4n+ 1) + 4p2 - 2 = 0
    2. n2 - 2np + 4p2 + 6 = 0
    3. n2 - n(4p + 1) - 2 = 0
    4. n2 + 4(4n + p) - p2 = 0
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