A partial order is deined on the set S = {x, a1, a2, a3,...... an, y} as x ≤ a i for all i and ai ≤ y for all i, where n ≥ 1. Number of total orders on the set S which contain partial order ≤

A partial order is deined on the set S = {x, a1, a2, a3,...... an,

1.	A partial order is deined on the set S = {x, a1, a2, a3,...... an, y} as x ≤ a i for all i and ai ≤ y for all i, where n ≥ 1. Number of total orders on the set S which contain partial order ≤
A.	n !
B.	1
C.	n
D.	n + 2
Answer» B. 1