Please help me to understand this... I am always terrified when i face PROBABILITY questions...
Q. When choose 3 out of 8 books, the probability of the most expensive two books must be included?
Please helpe me kindly and thank you in advance...
Out of 8 .. 2 books (which are most exp) should be considered in your selection.
No of ways the 2 Exp books can be selected = 2c2 = 1
remaining we need to choose one more book from the 6 left over books = 6c1 = 6
Total ways of selecting 3 books out of 8 = 8c3
Prob = 1X6 / 8c3 = 3/28
If u like my post..... payback in Kudos!!
|Do not post questions with OA|Please underline your SC questions while posting|Try posting the explanation along with your answer choice|
|For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|
~~Better Burn Out... Than Fade Away~~