Which of these is an infinite set?
x:xinmathbbZ,x2<10\\{x : x \\in \\mathbb{Z}, x^2 < 10\\}x:xinmathbbZ,x2<10
x:xinmathbbR,0<x<1\\{x : x \\in \\mathbb{R}, 0 < x < 1\\}x:xinmathbbR,0<x<1
Planets in the solar system
Prime numbers less than 100