Question

Write the set $\{x\in N:x^2<40\}$ in the roster form.

• A. $\{1,2,3,4,5,6\}$
• B. $\{1,3,4,5,6\}$
• C. $\{1,2,3,5,6\}$
• D. $\{1,2,3,4,5\}$

Answer 1

Answer: (A)

$\{1,2,3,4,5,6\}$

$x$ is a natural number and $x^2<40$

$\Rightarrow x<\sqrt{40}$

$x<6.32$

So, the values of $x$ can be $1,2,3,4,5,6$

The given set in roster form is $\{1,2,3,4,5,6\}$.