If x = √11 + √20, y = √15 + √17 and z = √14 + √18, then which of the following holds true? Choose the correct choice from the following options:  A) x < y < z  B) Y< z < x  C) y < x < z  D) x < z < y  E) None of these
By squaring and simplifying,   x2 = 31 + 2√220   y2 = 32 + 2√255   z2 = 32 + 2√252   x2 &lt; z2 &lt; y2 =&gt; x &lt; z &lt; y.   Answer:x &lt; z &lt; y
<result>D</result>
If x = √11 + √20, y = √15 + √17 and z = √14 + √18, then which of the following holds true?