4. Assume that the repetition is not allowed. How many orders
that can be build from 6 numbers, 2, 3, 4, 5, 7 and 9, taken 3 at a
time, to produce any number in hundreds,
a) Without any condition
b) Produce values less than 400.
c) Produce the even values.
d) Produce the odd values.
e) Produce values that are the multiple of 5.