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The function g(x) is defined as the greatest integer less than or

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The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 18 Nov 2014, 07:34
1
12
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A
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C
D
E

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Tough and Tricky questions: Number Properties.



The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\), while the function \(h(x)\) is defined as the least integer greater than or equal to \(x\). What is the product \(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3)\)?

A. 6
B. 9
C. 12
D. 16
E. 24

Kudos for a correct solution.

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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 18 Nov 2014, 09:28
1
Some painfully annoying verbage going on here but:

g(x) is round down to nearest integer unless its an integer already
h(x) is round up to nearest integer unless its an integer already

so we have

(1)(3)(-2)(-2) as our equation, negative x negative cancels so 3 x 2 x 2 = 6 x 2 = 12.

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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 18 Nov 2014, 21:18
1
Given that
g(x)= greatest integer less than or equal to x
h(x)= least integer greater than or equal to x

g(1.7)* h(2.3)*g(-1.7)*h(-2.3) =?

so g(1.7)=1
h(2.3)=3
g(-1.7)=-2
h(-2.3)=-2

g(1.7)* h(2.3)*g(-1.7)*h(-2.3) =1*3*(-2)*(-2)=12

Answer is C
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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 18 Nov 2014, 23:03
1
Answer = C = 12

\(Product = 1 * 2 * -2 * -3 = 12\)
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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 19 Nov 2014, 06:54
Official Solution:

The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\), while the function \(h(x)\) is defined as the least integer greater than or equal to \(x\). What is the product \(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3)\)?

A. 6
B. 9
C. 12
D. 16
E. 24

In problems involving "decimal functions," which involve rounding decimals up or down to a nearby integer, we must be very careful to follow directions precisely. Here, we have two functions that have similar but distinct definitions.

To avoid confusion between the two functions, evaluate just one function's results first.

The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\). So \(g(1.7) = 1\), while \(g(-1.7) = -2\). Notice how this function operates on negative numbers. The results are not symmetrical: \(g(-1.7)\) does not equal the negative of \(g(1.7)\).

Likewise, we have the function \(h(x)\) defined as the least integer greater than or equal to \(x\). So \(h(2.3) = 3\), while \(h(-2.3) = -2\). Again, the results are not symmetrical: \(h(-2.3)\) does not equal the negative of \(h(2.3)\).

Now we multiply the results together:
\(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3) = 1 \times 3 \times (-2) \times (-2) = 12.\)

Answer: C.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 19 Nov 2014, 06:56
1
Bunuel wrote:
Official Solution:

The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\), while the function \(h(x)\) is defined as the least integer greater than or equal to \(x\). What is the product \(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3)\)?

A. 6
B. 9
C. 12
D. 16
E. 24

In problems involving "decimal functions," which involve rounding decimals up or down to a nearby integer, we must be very careful to follow directions precisely. Here, we have two functions that have similar but distinct definitions.

To avoid confusion between the two functions, evaluate just one function's results first.

The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\). So \(g(1.7) = 1\), while \(g(-1.7) = -2\). Notice how this function operates on negative numbers. The results are not symmetrical: \(g(-1.7)\) does not equal the negative of \(g(1.7)\).

Likewise, we have the function \(h(x)\) defined as the least integer greater than or equal to \(x\). So \(h(2.3) = 3\), while \(h(-2.3) = -2\). Again, the results are not symmetrical: \(h(-2.3)\) does not equal the negative of \(h(2.3)\).

Now we multiply the results together:
\(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3) = 1 \times 3 \times (-2) \times (-2) = 12.\)

Answer: C.


Check other Rounding Functions Questions in our Special Questions Directory.

Hope it helps.
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Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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New post 21 Mar 2017, 02:54
Bunuel wrote:

Tough and Tricky questions: Number Properties.



The function \(g(x)\) is defined as the greatest integer less than or equal to \(x\), while the function \(h(x)\) is defined as the least integer greater than or equal to \(x\). What is the product \(g(1.7) \times h(2.3) \times g(-1.7) \times h(-2.3)\)?

A. 6
B. 9
C. 12
D. 16
E. 24

Kudos for a correct solution.


g(1.7) = 1
h(2.3) = 3
g(-1.7) = -2
h(-2.3) = -2

product = 12
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Re: The function g(x) is defined as the greatest integer less than or  [#permalink]

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Re: The function g(x) is defined as the greatest integer less than or &nbs [#permalink] 15 Jul 2018, 05:41
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