1 1 vote Let $b$ be a positive integer and $a = b^2 – b$. If b $\geq$ 4, then $a^2 – 2a$ is divisible by $15$ $20$ $24$ None of these Quantitative Aptitude cat2001 quantitative-aptitude algebra + – go_editor 14.2k points 1.2k views answer comment Share Follow Print 0 reply Please log in or register to add a comment.