Madhavi1990 wrote:

Im not sure how B is suff.

|-1 + 3| < |-1| + |3| --> 2 < 4 suff

|-1 + 3| < 1 - 3 (opening 3 as negative, -1 remains one) --> 2 not less than -2

We get two cases.

Please explain B. Thank you!

I think you've gotten turned around a little in how you're looking at absolute values.

If a problem says something like |x| = 3, then x can equal 3 or -3. So, if a problem tells you what |x| is, and asks you about the value of x, you do what you described here.

However, if you're putting a number (or any known value)

inside of absolute value signs, then it will always become positive, no matter what. Since the problem talks about the value of |s| and the value of |t|, those two values, |s| and |t|, will always be positive numbers. Interpreting it as '1-3' is incorrect - it has to be 1 + 3 no matter what.

_________________