If you are dealt 2 cards from a regular 52-card deck, what is the probability of getting all 2 cards of the same suit? (suit means all diamonds, hearts, spades, or clubs) Round to the nearest thousandth

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?