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# The operation denoted by the symbol →is defined for all real

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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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The operation denoted by the symbol →is defined for all real [#permalink]  27 Mar 2018, 16:04
Expert's post
00:00

Question Stats:

60% (00:06) correct 40% (00:35) wrong based on 5 sessions
The operation denoted by the symbol →is defined for all real numbers a and b as a → b = $$a\sqrt{b}$$ . What is the value of 3 →(2→4)?

A. $$\frac{1}{4}$$
B. $$4$$
C. $$6$$
D. $$6\sqrt{2}$$
E. $$12$$

Drill 1
Question: 4
Page: 546
[Reveal] Spoiler: OA

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Sandy
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Intern
Joined: 02 Aug 2017
Posts: 24
Followers: 1

Kudos [?]: 12 [0], given: 4

Re: The operation denoted by the symbol →is defined for all real [#permalink]  27 Mar 2018, 21:24
3 →(2→4) = a*sqrt{b}
= 3-> (2xsqrt(4))
=3-> 4
=3xsqrt(4))
=6

ans: C
GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1665 [0], given: 396

Re: The operation denoted by the symbol →is defined for all real [#permalink]  28 Mar 2018, 13:29
Expert's post
Explanation

To follow the order of operations, first evaluate the expression in parentheses. 3 → (2→4)= 3 → $$2\sqrt{}4$$ =3→4=$$3\sqrt{4}$$ =6. The answer is choice (C).
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Sandy
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Re: The operation denoted by the symbol →is defined for all real   [#permalink] 28 Mar 2018, 13:29
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