Two fair tetrahedral dice with faces numbered 1,2,3 and 4 are thrown. The discrete random variable D is defined as the product of the two numbers thrown.
a: Find the probability distribution table of D.

b: Find P(D is a square number I D < 8).

c: In a CAS fundraising game, a prize of
US$12 is won if D is odd, and a prize of
US$6 is won if D is even. Find the price
of a ticket to ensure this is a fair game

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?

Use sigma notation to represent the following series for 9 terms.

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?