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Are you studying combinations and permutations?

Yes

Is this question a combination or a permutation? What do you think?

Remember that order doesn't matter in a combination but order does matter in a permutation.

i think the first one is a permutation

Right you are. In fact, they both are. Can you see that?

Yes, because they have to be in a certain order, right?

So, in the first question, you need to calculate\[_3 P_{10}\]Can you do that?

I'm not sure how too

I got -2 that's probably not correct is it?

See. Everything from 7 down will cancel out leaving\[_{10}P_3=10\times9\times8=?\]

720? that's what I got from the multiplication

Excellent. Now try the second question by yourself. You need to calculate\[_{10}P_4\]

5040?

Terrific. Well done.

Thanks!

You're welcome