Posted by **Katie** on Tuesday, February 15, 2011 at 5:25pm.

How many possible combinations for an 8-digit binary number are there? How did you get this an answer?

- 5th grade math -
**PsyDAG**, Wednesday, February 16, 2011 at 12:14pm
Can the numbers be repeated? If not, this is combination of arranging r items out of n items:

nCr = n!/r!(n-r)!

n = 10, r = 8

5! = 5 factorial = 5 * 4 * 3 * 2 * 1 = 120

- 5th grade math -
**brittany**, Thursday, February 24, 2011 at 6:46pm
the johnsons has ben verry bussy and havet done laundry in several weeks the dirty cloth pile hase 540 cloths they figur they can put 27 pices of clothing in a singal load. how many loads of laundry will the johnsens family to do to wash all the itams of clothing

- 5th grade math -
**Anonymous**, Saturday, June 18, 2011 at 11:24am
54

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