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The value of ∞ → n lim ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + + + ∑ = n 1 K 2 3 ! ) 3 k ( 5 k 11 k 6 k is :

1. 3 4
2. 2
3. 3 7
4. 3 5

Correct answer: 3 5

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