In how many ways can five students be seated in a straight line such that one of them Rahul is always at a corner position?

xyz = 24

24 = 2³ × 3

Let’s distribute 2, 3 among 3 variables. No. of positive integral solution =

No. of ways to distribute =

Every number between 1000 and 2000, which is divisible by five and which can be formed by the given digits, must contains 5 in unit's place and 1 in thousand's place. Thus we are left with four digits out of which we are to place two between 1 and 5, which can be done in 4P2 = 12 ways. Hence, 12 nu