Insert the missing number.
15, 31, 63, 127, 255, (....)
Answer: Option B
Explanation:
Each number is double the preceding one plus 1.
So, the next number is (255 x 2) + 1 = 511.
© 2008-2013 by IndiaBIX™ Technologies. All Rights Reserved | Copyright | Terms of Use & Privacy Policy Contact us: info@indiabix.com Follow us on twitter!