A computer prints out three digits chosen at random from 0 to 9 inclusive. Find the probability that:(adsbygoogle = window.adsbygoogle || []).push({});

a) all three digits are different

b) the third digit differs from the first two digits

For (a) I went [tex]1/_9C_3 = 1/84[/tex]. I think it's wrong but I didn't know what else to try.

And for (b) I don't even know where to start.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# How do you do this? Probability

**Physics Forums | Science Articles, Homework Help, Discussion**