9. Pythagorean Triplets are sets of three whole integers (i. e., no decimal or fractional numbers included) that fit the
Pythagorean Rule c = a + b? Determine whether the following sets of numbers are Pythagorean Triples.
Write yes or no for each set of numbers. (Hint: The "c" side is always the longest side.)
a) 8, 15, 17
b) 15, 20, 25
c) 20,48,52
d) 2, 9, 11
e) 39, 80, 89

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?