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△ABC△ABC is an isosceles triangle with AB=ACAB=AC and ADAD as the median to base BCBC. If ∠ABC=350∠ABC=350, the ∠BAD∠BAD is

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1,3,6,11,18,29,42... Emily was closely observing the proceedings for the vehicles at the parking lot. There were 'n' vehicles, 'x' of which are cars, 'y' are vans and the remainder are lorries. If every vehicle is equally likely to leave the lot, Emily wished to know the probability of:
a) van leaving first.
b) lorry leaving first.
c) car leaving second if either a lorry or van had left first.