Solved papers for JEE Main & Advanced JEE Main Paper (Held On 25 April 2013)

done JEE Main Paper (Held On 25 April 2013) Total Questions - 1

• question_answer1)                 If for positive integers\[\operatorname{r}>1,\operatorname{n},>2,\]the coefficients of the \[{{(3r)}^{\operatorname{th}}}\]and \[{{(\operatorname{r}+2)}^{\operatorname{th}}}\]  powers of \[x\]in the expansion of \[{{(1+x)}^{2n}}\] are equal, then n is equal to     JEE Main Online Paper ( Held On 25  April 2013 )
  A)
                  \[2r+1\]
  done clear
  B)
                                         \[2r-1\]
  done clear
  C)
                                         3r                                           
  done clear
  D)
                                         \[r+1\]                
  done clear
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