Find the number of non-negative integral solutions of `x+y+z+wlt=20.`

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

Find the number of non-negative integral solutions of equation x+y+z+2w=20

Find the number of non-negative integral solutions of the equation x+y+z=10 .

Find the number of non-negative solution of 3x+y+z=24

Find the number of non -negative integrral solutions of equation 2x+2y+z=20

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