Permutations Mathematics (S5)+

Permutations question explained by MIT PhD Dr. Steve Alexandris.

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• Permutations
• t1q17

[gmat]

many thanks...

[gmat]

Is isn't necessary to write out all 24 possibilities. We do that to help teach the concept and show students the underlying counting behind the math.

[gmat]

This is a little too hard for the SAT. This is more of a GMAT or advanced algebra question.

[Bouncertt]

thanx for the clear explaination Dr. but I can't see myself answering this question under 60 seconds if im gonna have to write down all the 24/48 possibilites... is there like a rule or something?...

thanx again, ur videos have been a big help

[xp0ferens]

You're a PhD in mathematics and you have to read off a screen to explain permutations? It just doesn't feel natural because you're not just speaking..

[trickster3619]

hats off mate!!!! excellent explanation!

[doclkk]

These are GMAT questions.

[hmillerwise]

There must be an easier way to solve this without having to write out the 24 possible positions for the object (2,4). Can you explain?

[Ingenue001]

Are these questions common on the SAT?