What is the value of [(2.1)3 - (1.8)3] / [(2.1)2 + (2.1 × 1.8) + (1.8)2]?

What is the value of [(2.1)3 - (1.8)3] / [(2.1)2 + (2.1 × 1.8) + (1.8)2]?
1). 0.6
2). 3.9
3). 0.03
4). 0.3

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