1. From a group of 21 astronaut that includes 12 people with previous experience in space flight, a 3 person crew is to be selected so that exactly 1 person in the crew has previous experience in space flight. How many different crew of this type is possible?
a. 432
b. 594
c. 864
d. 1330
e. 7980
2 Machine A produces pencils at a constant rate of 9,000 pencils an hour and machine b produces at a constant rate of 7,000 pencils an hour. If both machines are to combine to produce 100,000 pencils, how long will machine B operate at a minimum, if either machine can work at most 8 hours.
a. 4
b. 4 2/3
c. 5 1/3
d. 6
e. 6 ¼
a. 432
b. 594
c. 864
d. 1330
e. 7980
2 Machine A produces pencils at a constant rate of 9,000 pencils an hour and machine b produces at a constant rate of 7,000 pencils an hour. If both machines are to combine to produce 100,000 pencils, how long will machine B operate at a minimum, if either machine can work at most 8 hours.
a. 4
b. 4 2/3
c. 5 1/3
d. 6
e. 6 ¼
