Probability - Exam with 2 parts question

[nnc2]

Hi,

I am having a bit of a problem here with a question. It is rather straight forward but I'm just banging my head here.

Q: An exam has 2 parts. Part A contains 25 question with probability .9 of answering them correct. Part B contains 36 question with probability .7 of answering them correct. What is the probability that I get > 75% correct of this exam? Each question is independent of the next.

Any light would be appreciated.

Thank you.

[nnc2]

Thanks I got it.