Does anyone can help me with pseudorandom number and binary key question?

I'm having difficulties to solve two questions. One of the question is about binary key and another is about pseudorandom number. I have been trying to solve the questions for 3 days. This is my last resort. Unfortunately, I can't upload the question over here. Can anyone kindly give me your email address so i can send you the question? Desperately need help from any kind soul...