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GENERAL RULE
A general rule is to subtract the probabilities with an even number of components inside the parentheses and add those with an odd number of components (one or three) to arrive at the probability of events.
Example
Consider a bag containing 4 white and 5 black balls. A man draws 3 balls at random; let us see what is the probability that all three are black?
The total number of ways in which 3 balls can be drawn is 9C3and the number of ways of drawing 3 black balls is 5C3therefore the probability of drawing 3 black balls is given by
P(All three are black)
carlie is now fivetimes as old as henry. in nine years her age will be twice henry''s age then. how old is carly now
A man invests rs.10400 in 6%shares at rs.104 and rs.11440 in 10.4% shares at rs.143.How much income would he get in all??
cos inverse x -cos inverse 2x=pie\2
I am here to tell you, Alex has a cold.
The region bounded by y=e -x and the x-axis among x = 0 and x = 1 is revolved around the x-axis. Determine the volume and surface area of this solid of revolution.
what are challenges and solution of international marketing
5289441+4684612131
The government is auctioning off oil leases at two sites. At each site, 100,000 acres of land are to be auctioned. Cliff Ewing, Blake Barnes and Alexis Pickens are bidding for the
need answer to integers that equal 36
Children Learn From Each Other : The other day I had gone to a, nearby school to observe the teacher-children interaction. The children were working on a problem that the teacher
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