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     EduGorilla 
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    The coefficient of x5 in the expansion of (1 + x)21 + (1 + x)22 + ……… + (1 + x)30 is

    Options :-

    1. 31C621C6
    2. 51C5
    3. 9C5
    4. 30C5 + 20C5
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