There is a sequence ni such, in which i is a positive integer, ni+1=2ni.
If n1=1, n2=2, n3=4, n4=8, what is the scope including n61? Choose the correct choice
A) 100~1,000	B) 1,000~10,000	C) 10,000~100,000	D) 100,000~1,000,000	E) 1,000,000,000,000,000,000~
There is a sequence ni such, in which i is a positive integer, ni+1=2ni.   If n1=1, n2=2, n3=4, n4=8, what is the scope including n61?   A. 100~1,000   B. 1,000~10,000   C. 10,000~100,000   D. 100,000~1,000,000   E. 1,000,000~   -&gt; ni=2^(i-1) -&gt; 2^10=1,024&gt;1,000=10^3 -&gt; n61=2^60=(2^10)^6&gt;(10^3)^6=10^18   Thus, the answer is 1,000,000,000,000,000,000~.
<result>E</result>
There is a sequence ni such, in which i is a positive integer, ni+1=2ni.
If n1=1, n2=2, n3=4, n4=8, what is the scope including n61?