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For $| x | < \large\frac{1}{5}$, the coefficient of $x^3$ in the expansion of $\large\frac{1}{(1-5x)(1-4x)}$ is :

\[\begin {array} {1 1} (1)\;369 & \quad (2)\;370 \\ (3)\;371 & \quad (4)\;372 \end {array}\]

1 Answer

(a) 369
answered Nov 7, 2013 by pady_1
 

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