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If the lengths of the sides of a traingle are in A. P. and the greatest angle is double the smallest, then a ratio of lengths of the sides of this triangle is -

1. 5 : 6 : 7
2. 4 : 5 : 6
3. 3 : 4 : 5
4. 5 : 9 : 13

Correct answer: 4 : 5 : 6

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