Qualification > Math
S1 and S2 DOUBTS HERE!!!!
astarmathsandphysics:
Try this
~ Miss Relina ~:
--- Quote from: astarmathsandphysics on October 12, 2011, 08:59:15 am ---Try this
--- End quote ---
Thank you Sir .......... but I'm sorry if I disturbed you by asking you plz could you explain the book answer
attached .................what I don't understand is how he get the probability of sticking to the door choosen before and getting the correct door ??? ??? :-\ :-\ :-\ :-\
astarmathsandphysics:
There are three doors and initially the probability of picking the correct door is 1/3
After the host picks one of the two not chosen, it is as if the probability of the car being behind the door he has chosen is given to the one remaining unchosen door. so 1/3 +1/3=2/3
ashwinkandel:
Ann, Barry and Clare are three students taking a multiple choice examination paper. For each question a student has to select the correct answer from five that are offered. For Question 1, Ann has no idea of the correct answer, Barry correctly identifies one answer that is wrong and Clare correctly identifies two wrong answers. All three students decide to guess at random from the answers they think stand a chance of being correct. Calculate the probability that:
a. none of the three students chooses the correct answer.
b. Clare is the only one to choose the correct answer.
c. exactly one of the three students chooses the correct answer.
astarmathsandphysics:
here
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