How many terms are there in 2,4,8,16……1024?
Select: A) 10 B) 12 C) 14 D) 16 E) 15
Clearly 2,4,8,16……..1024 form a GP. 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=1024 or 2^n-1=512 = 2^9.   n-1=9 or n=10   10nswer is 10.
<result>A</result>
How many terms are there in 2,4,8,16……1024?