Mathematics

Problem

Arrange the following numbers in ascending order:

\sqrt{12}\times\sqrt{3},\;\sqrt{45},\;6.9

. a)

\sqrt{12}\times\sqrt{3}<6.9<\sqrt{45}

\sqrt{45}<6.9<\sqrt{12}\times\sqrt{3}

\sqrt{12}\times\sqrt{3}<\sqrt{45}<6.9

6.9<\sqrt{12}\times\sqrt{3}<\sqrt{45}