The french the patriot war effort by a. attacking the main island of britain to distract british forces. b. keeping spain out of the war. c. going to war against hostile native american groups. end of exam d. providing a navy and military support.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?