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$^nC_{r-1}=330,\;^n C_r =462,\;^n C_{r+1}=462 =>r\;$=

\[(a)\;3 \quad (b)\;4 \quad (c)\;5 \quad (d)\;6 \]

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1 Answer

(c) 5
answered Nov 7, 2013 by pady_1
 
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