How many terms are there in 2, 4, 8, 16,..., 4096?  Choose the correct choice:
A) 14 B) 11 C) 12 D) 10 E) 8
2, 4, 8, 16, ..., 4096 is a G.P with a =2   and r =4/2= 
<gadget id="calculator">4/2</gadget>
<output>2</output>
2   Let the number of terms be n. Then   2 x 2 ^n-1= 4096   or 2^n-1 = 2048 = 2^11   Thus n - 1 =11   n= 12   ANSWER:12
<result>C</result>
How many terms are there in 2, 4, 8, 16,..., 4096?