I need help with both problems, any and all help will be appreciated. Thank you! :)

Problem 3: (i) Assume ={a,b}. For the following set, give the list of elements form. {ww, w contains exactly two as}{ww, w contains exactly two bs} Note: means alphabet and means strings made of symbols from the alphabet (ii) In the following problems, the universe is R. Determine the following: (a) [0,3][2,6] (b) [0,3][2,6] (c) [0,3][2,6] Problem 4: Suppose A={1,3,7,11} and B={3,7,12}. Calculate the following showing the step-by-step process of your calculations (Remember | | means cardinality): (a) AB (b) A+BAB (c) AB