Sagot :
k=0 because any other answer does not work, they all are not in the parentheses above. 0 plus every number is the same number, which is still above.
Just by trying out the options,
K = 0,
0 plus any of the number (6,2,1,3) still results to 6,2,1,3 which is in the set.
option (D) is the answer.
K = 0,
0 plus any of the number (6,2,1,3) still results to 6,2,1,3 which is in the set.
option (D) is the answer.