How many solutions are there to the equation where i 1 2

How many solutions are there to the equation , where  , i = 1, 2, 3, 4, 5, is a nonnegative integer such that.

a) < >₁ ? 1?

b) Xi>for i = 1, 2, 3, 4, 5?

c) 0<x1<10?

d) 0<x1<3,1<x2<4, and x3>

parts b,c,d have < with a - line under it, i dont have anyway to make that symbol

Solution

a) constrains x1 to be greater than zero; c) allows it to be zero.

b) constrains x2 to be greater than 1; d) allows it to be 1.

Which constraints apply?