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If the coefficient of a^7 b^8 in the expansion of (a + 2b + 4ab)^10 is K.2^16, then K is equal to _____.

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If the coefficient of a7b8  in the expansion of (a + 2b + 4ab)10 is K.216, then K is equal to _____. 

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= 315 × 216

\(\Rightarrow\) k = 315

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