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An elevator starts with 5 person on board and goes up 5 floors...
What is the probability that all 5 passengers are on a different floor?
a>24/109
b>55/412
c>10/512
d>none of these

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TCS Other Question

24 random points. 7 are collinear. Any 3 points are not collinear.find the number of triangles formed. If:
212 = 6,
327 = 9,
624 = 4,
330 = 10,
Then: 515 = ??