1.

If the number of ways of selecting 3 numbers out of 1,2,3,…,2n+1 such that they form an increasing arithmetic progression is 441, then the sum of the divisors of n is equal to

Answer»

If the number of ways of selecting 3 numbers out of 1,2,3,,2n+1 such that they form an increasing arithmetic progression is 441, then the sum of the divisors of n is equal to



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