How to see combination and permutation problems differently?

There’s several ways to see combination and permutation problems. Once the first explanation clicks, we can go back and see it a different way. When trying to build math intuition for a problem, I imagine several mental models circling a core idea. Starting with one insight, I work around to the others.

Is there a better way to say ” I’m not sure I understand “?

You could also just say something like: “I’m confused” “I’m a little confused” “I don’t understand” “I don’t quite understand” “I’m not sure I understand” “Can you explain that again?”. “I’m not sure I understand this correctly” sounds quite natural, but it’s usually followed by a summary of what you think the other person is saying in the form …

Can you ask simple questions and understand longer answers?

Can ask simple questions and can understand simple answers. Can ask all types of general questions and can understand longer answers. Can understand long, complex answers. Sign up for premium, and you can play other user’s audio/video answers. Tired of searching? HiNative can help you find that answer you’re looking for.

How to navigate a grid using combinations and permutations?

Avoid backtracking — you can only move right or up. Spend a few seconds thinking about how you’d figure it out. When considering the possible paths (tracing them out with your finger), you might whisper “Up, right, up, right…”. Why not write those thoughts down?

How many combinations are there in a grid?

And 9 for the second, 8 for the third, and 7 choices for the final right-to-up conversion. There are 10 * 9 * 8 * 7 = 10!/6! = 5040 possibilities.

Who was able to help neither Carol or Kim?

Neither Jackie nor Sandy were able to help their friend Kim solving her problem. Neither Jackie nor Sandy were able to help their friend Kim solve her problem. Neither Jackie nor Sandy were able to help their friends Kim and Carol solve either of their problems. I have not seen that boy. Neither at home nor at school.