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17. In a box there are X green balls, 3X+6 red balls and 2 yellow ones. If there are no other colors what is the probability
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4. If cosec 18º = sec A, then the measure of A is
22. From the top of a 9m high building AB, the angle of elevation of the top of a tower CD is 30º C and the angle of depression of the foot of the tower is 60º. Find the height of the tower