The number of non negative integral solution of `x+y+z leq n`, where `n in N`

The number of non negative integral solution of x+y+z<=n, where n in N

The number of non-negative integral solutions of x+y+z<=n, where n in N is

The number of non-negative integral solutions of x+y+z<=n, where n in N is

The number of non negative integral solutions of 3x+y+z=24 is

The number of non negative integral solutions of 3x+y+z=24 is

The number of non negative integral solutions of 3x+y+z=24 is

The number of non negative integral solutions of 3x+y+z=24 is

The number of non negative integral solutions of 3x+y+z=24 is

If the number of non-negative integral solutions of 3x+y+z<=30 is N.where N is a four-digit integer 'abba,'then the value of b-a is