Let f : R R be a function defined as
f(x) = \left\{ {\matrix{
5 & ; & {x \le 1} \cr
{a + bx} & ; & {1 < x < 3} \cr
{b + 5x} & ; & {3 \le x < 5} \cr
{30} & ; & {x \ge 5} \cr
} } \right.
Then, f is
JEE Main 2019 · 9 Jan, Morning shift · Q4133