Three cubes with sides in the ratio 3 ∶ 4 ∶ 5 are melted to form a single cube whose diagonal is 12√3 cm . The sides of the cubes are -

1
3 cm, 4 cm, 5 cm
2
6 cm, 8 cm, 10 cm
3
9 cm, 12 cm, 15 cm
4
None of these

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