Question

48. which of the following is a metric on the set of all real
numbers R
(A) d(x, y) = (x + y + 11
(B) d(x, y) = x - y
(C) d(x, y) = x - y + 11
(D) None of these​

Answer 1

Answer:

option b is always metric on set because they hold all properties of metric