If p, q, r and s are real numbers then which of the following is always true?
Explanation:
Option (a): Let p = 10, q = -5, r = -2 and s = -3 Now, pr = -20 while qs = 6 ∴ pr < qs ⇒ option (a) is not necessarily true
Option (b): Let p = 10, q = -5, r = -2 and s = -30 Now, p - r = 12 while q - s = 25 ∴ p - r < q - s ⇒ option (b) is not necessarily true
Option (c): This is a standard result.
Hence, option (c).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.