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Find the greatest coefficient in the expansion of `(a + b + c+ d)^(15)`.

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Here , n= 15 and k = 4
` [ because a, b,c,d` are terms ]
` ""^(12)C_(6) a^(6) b^(6) = 924 a^(6) b^(6)`
` therefore` q = 3 and r = 3
Hence , greatest coefficient `= (15!)/((3!)^(1) (4!)^(3))`
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