SOLUTION: In a learning task, a subject is presented with five buttons. He must learn to press a certain three of them in a predetermined order. What chance does the subject have of pressing
Algebra ->
Probability-and-statistics
-> SOLUTION: In a learning task, a subject is presented with five buttons. He must learn to press a certain three of them in a predetermined order. What chance does the subject have of pressing
Log On
Question 144654: In a learning task, a subject is presented with five buttons. He must learn to press a certain three of them in a predetermined order. What chance does the subject have of pressing correctly on the first time. Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! I assume that he may not press the same button twice.
Since order is important permutations apply.
P=n!/(n-r)!
=5!/(5-3)!
=(5*4*3*2!)/2!
=5*4*3
=60 possible ways to press 3 of the 5 buttons in the correct order.
chance of pressing the 3 buttons in the correct order the 1st time: 1/60
.
Ed
