List all elements of the set-7/6, -6,0, 10, 3.73773777
.. that are also elements of the set of irrational numbers
select all that apply.
a.-7/6
b.0
c.3.73773777
d.-6
e.0
f. no elements in the set are in the set of irrational numbers.

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?