ASVAB Armed Services Vocational Aptitude Battery (#64)

Section: Mathematics Knowledge

For a special operations air assualt mission, one extra soldier for the security element is to be chosen at random from among three soldiers from the 327th Infantry Regiment, two soldiers from the 502nd Infantry Regiment, and five soldiers from the 187th Infantry Regiment. What is the probability that a soldier from the 327th Infantry Regiment will be chosen?

3/10
1/10
1/3
3/7