5.1 Combination and permutation
a) 5C2
b) 5!
c) Five different drugs, A, B, C, D, and E, can be used to treat
a disease in different combinations. If a physician uses two of
them to treat patients, how many combinations are possible? List
all such combinations.
d) Four different exercises, A, B, C, and D, are recommended for
an injury recover therapy program. The therapists want to know
whether there is a different treatment effect using i) just one;...