answer only 18, 15 is the reference matlab only

QUESTION 15 For Questions 15 through 21, refer to the row vectors a and b defined below = [1 5 2 7); b = [2 3 4 0]; 15. The matrix M = [1527; 2340] can be formed by the command 2.M=[a b]; 3.M=[a', b']; 4.M=[a'; b); QUESTION 18 18. What is the output for the command (a > 3) & (b > 2)? 1.0 100 2. po 10 0] 3. p 111 4. None of the above or an error message will be displayed. 1 3 @