Which of the following plants are used as green manure in crop fields and in sandy soils?
- ACrotalaria juncea and Alhagi camelorum
- BCalotropis procera and Phyllanthus niruri
- CSaccharum munja and Lantana camara
- DDichanthium annulatum and Acacia nilotica
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$A$ tower subtends angles $\alpha, 2 \alpha$ and $3 \alpha$ respectively at points $A, B$ and $C$,all lying on a horizontal line through the foot of the tower. Then $\frac{A B}{B C}$ is equal to:
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