Homework Help: math

Posted by Nicole on Thursday, January 13, 2011 at 9:51pm.

Cher has forgotten the combination to her locker. She knows it consists of four numbers -- 3, 5, 7, and 9 -- but she can't recall the order. She decides to try every possible order until she gets the right one.

How many possible orders are there?

math - matt, Thursday, January 13, 2011 at 10:25pm
im pretty sure its 256. These r permutations right
math - tchrwill, Friday, January 14, 2011 at 9:18am
Four possibilities for the first number.

Four possibilities for the second number

Therefore, 4x4 = 16 possibilities for the first two numbers.

Four possibilities for the third number

Therefore, 16x4 = 64 possibilitites for the first three numbers.

I think you can now see what the total number of arrangements of all four numbers will be.
math - Kiara, Tuesday, May 21, 2013 at 1:49pm
The Correct Answer is: 24 orders

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