No need working, just need final answer

Q3 What is the best statement in words to describe (3x X, Vx ex)? Select one: O a. The square root of every natural number is also a natural number. O b. There is a natural number which square root is also a natural number. O c. The square root of a natural number is also a natural number. O d. There is one and only one natural number which square root is also a natural number. Q15 For all sets A, B, and C, which of the following statements are true? 1. An(B - A) = 0 2. BU(B - A)=B 3. AU(AB)=B Select one: O a. Except (3), all are true Ob. Only (2) is true O c. Only (1) is true O d. Only (3) is true Q7 In using Euclidean Algorithm to find god(x, y), we will express gcd(x, y) = gcd(X1, y1) = god(X2, y2) =....-gcd(Xn, 0), what is the value of n for gcd(832, 10933)? Answer: Q3 The following is a proof for n+1