If 18Cr = 18Cr+2 ; find rC5.
56
63
49
42
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One red flower, three white flowers, and two blue flowers are arranged in a line such that
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2
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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3
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The number of circles that can be drawn out of 10 points of which 7 are collinear is
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4
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The students in a class are seated, according to their marks in the previous examination. Once, it so happens that four of the students got equal marks and therefore the same rank. To decide their seating arrangement, the teacher wants to write down all possible arrangements one in each of separate bits of paper in order to choose one of these by lots. How many bits of paper are required?
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If
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If P(A)=2/5, P(B)=3/10 and P(A ∩ B) =51, then P(A' | B'). P(B' | A') is equal to
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