If r > 1 and s = 2^(r −1), then 4^r =
Choose the correct option:
A) 16s^2 B) 4s^2 C) s^2 D) s^2/4 E) s^2/16
If r &gt; 1 and s = 2^(r −1), then 4^r   Given r&gt;1, so let's assume r=2   s=2^(r-1) = 2^(2-1) = 2, so s=2   hence, 4^r = 4^2 = 16   only 1 ans. choice can satisfy this:   A) 16s^2 --&gt; clearly &gt; 16   B) 4s^2 --&gt; 4*2^2 = 16(we can stop after this as there can be only 1 right answer)   C) s^2 --&gt; clearly &lt; 16   D) s^2/4 --&gt; clearly &lt; 16   E) s^2/16 --&gt; clearly &lt; 16   Ans. 4s^2) 4s^2
<result>B</result>
If r > 1 and s = 2^(r −1), then 4^r =