The number of ways in which ten candidates A_(1),A_(2),A_(3),A_(4),……,A_(10) can be arranged in a row if A_(1) is just above A_(2) then the number of ways are
The number of ways in which ten candidates A_(1),A_(2),A_(3),A_(4),……,A_(10) can be arranged in a row if A_(1) and A_(2) are next to each other is