For the sets $S = \{x : x$ is a positive integer and $x^2

Question

For the sets $S = \{x : x$ is a positive integer and $x^2 < 16\}$, $T = \{x : x$ is a positive integer and $x^2 < 20\}$, $P = \{x : x$ is a positive integer and $\sqrt{x} < 2\}$, the universal set $U$ may be taken as:

Accepted Answer

$\{x : x$ is a positive integer$\}$

Answer

$\{1, 2, 3\}$

Answer

$\{x : x$ is a real number$\}$

Answer

$\emptyset$

For the sets S={x:xS = \{x : xS={x:x is a positive integer and x2<16}x^2 < 16\}x2<16}, T={x:xT = \{x : xT={x:x is a positive integer and x2<20}x^2 < 20\}x2<20}, P={x:xP = \{x : xP={x:x is a positive integer and x<2}\sqrt{x} < 2\}x​<2}, the universal set UUU may be taken as:

For the sets $S = \{x : x$ is a positive integer and $x^2 < 16\}$ , $T = \{x : x$ is a positive integer and $x^2 < 20\}$ , $P = \{x : x$ is a positive integer and $\sqrt{x} < 2\}$ , the universal set $U$ may be taken as: