# 5th grade math

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

• 5th grade math -

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 -

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 -

54

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