inequalities

[acecoolan]

Q. If 1 > 1 - ab > 0, which of the following must be true?

1. a/b > 0
2. a/b < 1
3. ab < 1

a) 1 only
b) 2 only
c) 3 only
4) 1 and 2 only
5) 1 and 3 only

OA E

[logitech]

1 > 1 - ab > 0

0>-ab So ab > 0 which means a+,b+ OR a-,b-

1 > 1 - ab > 0

1>ab

ST1) TRUE both +/+ and -/- satisfy a/b > 0
ST2) WRONG we don't know for sure which one is bigger ( a or b )
ST3) TRUE

Choose E