If the number of ways of selecting \( 3 \) numbers out of \( 1,2,3,...

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If the number of ways of selecting \( 3 \) numbers out of \( 1,2,3, \ldots, 2 n+1 \) numbers such that they are in A.P. is \( 441  \), then the sum of divisors of \( n \) is :
 
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