O PROBABILITY Introduction to permutations and combinations
Suppose we want to choose 2 letters, without replacement, from the 5 letters A, B, C, D, and E.
(a)
How many ways can this be done, if the order of the choices is taken into
consideration?
(
(b)
How many ways can this be done, if the order of the choices is not taken into
consideration?

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)

a.for lorena 14 hours makes $126   for 16 hours she makes 144

for julie 6 hours makes $72 for 21 hours its $252

b. julie makes more money than lorena julie makes $12 an hour and lorena makes $9  

.