Q1: A box containing 12 gold coins and 10 silver coins. Ann repeats drawing a coin at a time randomly front the box without replacement until a silver coin is drawn.
Find the probability that
a) exactly two draws are needed
b)exactly three draws are needed
c) at least three draws are need
Q2:65 per cent of staff are single and 40 percent of...
1)Bag A contains 3 red balls and 2 white balls. Bag B contains 2 red balls and 4 white balls.
An item is randomly taken from bag A and put into bag B.Then an item is randomly taken from bag B.Find the probability that one red ball is taken from bag B.
2) 50 students joined the test in the class.30 of them passed the test. Two students are...