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If a > b and c < a, which of the following must be true?

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If a > b and c < a, which of the following must be true? [#permalink]

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New post 07 Sep 2017, 23:09
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45% (01:06) correct 55% (00:53) wrong based on 77 sessions

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If a > b and c < a, which of the following must be true?

I. a > b > c
II. 2a > b + c
III. a^2 > bc

A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III
[Reveal] Spoiler: OA

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Kudos [?]: 132880 [0], given: 12390

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If a > b and c < a, which of the following must be true? [#permalink]

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New post 07 Sep 2017, 23:19
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Given
a>b ---(1)
a>c ---(2)

I. a > b > c
lets consider a=5 b=2 and c=3
a>b-- true a>c-- true
but a>b>c -- not always true
Hence I is out.

II. 2a > b + c
add (1) and (2)
a+a>b+c
2a>b+c
hence true

III. a^2 > bc
lets consider (A) a=5 b=2 and c=3
a^2=25 and b*c= 6
(B) a= -6 , b=-7, c=-9
a^2=36 and b*c= 63
Not always true

Hence Answer is only II Option B

Kudos if it helps

Last edited by pushkarajnjadhav on 07 Sep 2017, 23:43, edited 3 times in total.

Kudos [?]: 21 [1], given: 41

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Re: If a > b and c < a, which of the following must be true? [#permalink]

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New post 07 Sep 2017, 23:31
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Bunuel wrote:
If a > b and c < a, which of the following must be true?

I. a > b > c
II. 2a > b + c
III. a^2 > bc

A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III


let (a,b,c) be (-5, -6, -6) then
only II follows
B
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Luckisnoexcuse

Kudos [?]: 161 [1], given: 134

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Joined: 31 Aug 2017
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Kudos [?]: 2 [0], given: 11

Re: If a > b and c < a, which of the following must be true? [#permalink]

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New post 08 Sep 2017, 00:10
Bunuel wrote:
If a > b and c < a, which of the following must be true?

I. a > b > c
II. 2a > b + c
III. a^2 > bc

A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III


a>b
a>c
b,c not sure which one is bigger
Option I out

Adding inequalities
Option II is correct

Multiplying inequalities only when both sides are positive. In this case, unclear.
Option III is out.

The answer is A

Kudos [?]: 2 [0], given: 11

Re: If a > b and c < a, which of the following must be true?   [#permalink] 08 Sep 2017, 00:10
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If a > b and c < a, which of the following must be true?

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