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could someone please help me with these 2 problems explaining the reasoning behind them?
thank you.
PROBLEM 1
figure doc.1
The figure shown represents a board with four rows of pegs, and at the bottom of the board are four cells numbered 1 to 4. Whenever the ball shown passes through the opening between two adjacent pegs in the same row, it will hit the peg directly beneath the opening. The ball then has probability 1/2 of passing through the opening immediately to the left of that peg and probability 1/2 of passing through the opening immediately to the right. What is the probability that when the ball passes throught the first two pegs at the top it will end up in cell 2?
PROBLEM 2
figure doc.2
A person walks from point A to point B along a route confined to the grid of four streets and three avenues shown in the figure. How many routes from A to B can the person take that have minimum possible lenght?
Last edited by simone (2007-10-07 01:14:20)
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