How many terms are there in 2,4,8,16……1024?  Choices:
A) 10	B) 14	C) 16	D) 18	E) 20
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 2n-1=1024 or 2n-1 =512 = 29.   n-1=9 or n=10.   10NSWER 10 10
<result>A</result>
How many terms are there in 2,4,8,16……1024?