Write echo statements that create three trees like these: Write 4 echo statements that is different?     *     *** *****     *

What does the following code do? In [1]: def mystery (a, b) : if b == 1: return a else: return a + mystery (a, b - 1) In [2]: mystery (2, 10) Out [2]: ?????

# Initialize sets A and BA = { 'a', 'b', 'c', 'd', 'e', 'f' }B = { 'c', 'd', 'f', 'h', 'j', 'k' } print('A = ', sorted(A))print('B = ',sorted(B))print(' ') AsymdiffB = set()# put your code here to compute the symmetric difference of A and B# first add all the elements that are in A but not B# then add all the elements that are in B but not A print('Symmetric Difference of A and B = ', sorted(AsymdiffB))