3.) La base de un triángulo mide 3 cm. La altura mide 6.5 cm. Si el factor de escala es 2, ¿cual es el área de la copia? c.) 78 a.) 39 b.) 16​

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?