Trigonometric Equations Question 33

Question: If $ a,\ b,\ c $ are the sides of a triangle ABC, then which of the following inequalities is not true

[Kurukshetra CEE 1996]

Options:

A) $ 8abc\le (a+b)(b+c)(c+a) $

B) $ 3abc\le a^{3}+b^{3}+c^{3} $

C) $ 6abc\le bc(b+c)+ca(c+a)+ab(a+b) $

D) $ abc\le (a+b-c)(b+c-a)(c+a-b) $

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Answer:

Correct Answer: D

Solution:

  • Trick: Let $ a=2,,b=3,,c=4 $ and check with the options.