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If the sum of the first 15 terms of the series .... 4 3 3 3 4 1 2 2 1 1 4 3 3 3 3 3 3 + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ is equal to 225 k, then k is equal to :

1. 9
2. 108
3. 27
4. 54

Correct answer: 27

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