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If the angles of elevation of the top of a tower from three collinear points A, B and C, on a line leading to the foot of the tower, are 30º, 45º and 60º respectively, then the ratio, AB : BC, is :

1. 3 :1
2. 3 : 2
3. 1 : 3
4. 2 : 3

Correct answer: 3 :1

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