Math 157
posted by Ty .
A ship carries exactly 10 different signal flags. If each
possible combination and ordering of 4 of these flags
connotes a specific message, how many signals can be
sent with these flags, taken 4 at a time?

How about trying some of these yourself?
Let us know what you have done so far? 
I have and if you don't want to help don't post anything thank you.

You've posted 14 math questions today, and have received help on some of these. We can help you better if we have some idea of your thinking.
Please note that Jiskha isn't here to give answers.