Question

The no. Of non negative integral sol of x1+x2+x3+4x4=20 is

Answer 1

x1+x2+x3+4x4=20
6x+16=20
6x=20-16
x=4/6
x=2/3

Answer 2

it is monotonically increasing graph so only one positive solution is possible if the question is x^1+x^2 ...,.