1 answer

Starting with 10 blue balls, in each of 10 sequential rounds, we remove a random ball...

Question:

Starting with 10 blue balls, in each of 10 sequential rounds, we remove a random ball and replace it with a new red ball. For example, after the first round we have 9 blue balls and one red ball, after the second round with probability 9/10 we have 8 blue balls and 2 red balls, and with probability 1/10 we have 9 blue balls and one red ball, etc.

What is the probability that the ball we remove at the 11th round is blue?


Answers

B. Starting 10BLAMentin 7 m lach hih 10 blue baMs, an dem ban and rylne rmds WR (7 t) dran na b lne delns. rh mder ary he win10-80 (bn) To 10 ETEEC0) 10-bn m-12 7 44-29 9-4901 10 7ETa1) Ebn) 1 a blne ban in ihe prraci Gity f darantng h4 h draw expur

.

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