Evaluate the expression above, where are positive factors of 360.
For more problems like this, try this set and easier set .
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I used the theorem that for any α ,
n = 1 ∑ ∞ i = 1 ∏ n ( α + i ) ( n − 1 ) ! = α 1 ⋅
Hence, the equation above can be simplified to:
1 6 ⎝ ⎛ α ∈ p o s i t i v e f a c t o r s o f 3 6 0 ∑ α 1 ⎠ ⎞ ⋅
But, as α ∈ p o s i t i v e f a c t o r s o f 3 6 0 ∑ α 1 = 3 6 0 sum of positive factors of 360 = 3 6 0 1 1 7 0 ,
⟹ 1 6 ⎝ ⎜ ⎜ ⎜ ⎜ ⎛ α ∈ p o s i t i v e f a c t o r s o f 3 6 0 ∑ ⎝ ⎜ ⎜ ⎜ ⎜ ⎛ n = 1 ∑ ∞ i = 1 ∏ n ( α + i ) ( n − 1 ) ! ⎠ ⎟ ⎟ ⎟ ⎟ ⎞ ⎠ ⎟ ⎟ ⎟ ⎟ ⎞ = 1 6 ( 3 6 0 1 1 7 0 ) = 5 2