5th grade math
posted by Katie on .
How many possible combinations for an 8-digit binary number are there? How did you get this an answer?
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
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