A lot contains 20 articles. The probability that the lot contains exactly 2 defective articles is 0.4 and the probability that it contains exactly 3 defective articles is 0.6. Articles are drawn from the lot at random one by one, without replacement and tested till all defective articles are found. The probability that the testing procedure ends at the 12th testing is.
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In the figure, if AB ǁ CD, EF perpendicular on CD and GED = 114 O, Find the value AGE, GEF and FGE
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