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The number of non-zero terms in the expansion of $(1+ 3 \sqrt {2}x)^9+(1-3 \sqrt {2} x)^9$ is equal to :

\[(a)\;0 \quad (b)\;5 \quad (c)\;9 \quad (d)\;10\]

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(b) 5
answered Nov 7, 2013 by pady_1

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