0 votes 0 votes if $a^2+b^2+c^2=1$ then $ab+bc+ac$ lies in the interval $[1,2/3]$ $[-1/2,1]$ $[-1,1/2]$ $[2,-4]$ Quantitative Aptitude gate2015-ec-2 numerical-ability polynomials + – Milicevic3306 asked Mar 27, 2018 • retagged Feb 27, 2021 by Lakshman Bhaiya Milicevic3306 16.0k points 91 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.