From a group of 16 astronauts that includes 7 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 crews of this type are possible? Choose the most appropriate option:  A) 270  B) 252  C) 272  D) 292  E) 285
number of astronauts with previous experience = 7   Remaining =9   we need to pick exactly one from the first group   and 2 from the second group   (7C1)*(9C2)   =7*36= 
<gadget id="calculator">7*36</gadget>
<output>252</output>
252   Answer : 252
<result>B</result>
From a group of 16 astronauts that includes 7 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 crews of this type are possible?