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A number is “terrific” if it is a multiple of 2 or 3. How many terrifi

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Math Expert
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A number is “terrific” if it is a multiple of 2 or 3. How many terrifi  [#permalink]

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New post 24 Dec 2018, 01:04
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:17) correct 21% (01:11) wrong based on 41 sessions

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Re: A number is “terrific” if it is a multiple of 2 or 3. How many terrifi  [#permalink]

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New post 24 Dec 2018, 01:09
2,3,4,6,8,9,10. And the negative of these numbers. Total of 14 numbers.

And 0 is also a multiple of 2 or 3. Hence 15 numbers.

D is the answer

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New post 24 Dec 2018, 01:11
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Re: A number is “terrific” if it is a multiple of 2 or 3. How many terrifi  [#permalink]

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New post 24 Dec 2018, 01:18
Bunuel wrote:
A number is “terrific” if it is a multiple of 2 or 3. How many terrific numbers are there between –11 and 11?

A. 6
B. 7
C. 11
D. 15
E. 17


Starting from -11, every other number is a multiple of 2 and every third number is a multiple of 3.

-10,-8,-6,-4,-2,0,2,4,6,8,10(11) are multiples of 2 and -9,-6,-3,0,3,6,9(7) are multiples of 3.
Also, 0 is present in both the lists. The common numbers present in both the lists are -6,0,6(3)

Therefore, there are 11 + 7 - 3 = 15(Option D) terrific numbers between -11 and 11.
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Re: A number is “terrific” if it is a multiple of 2 or 3. How many terrifi  [#permalink]

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New post 24 Dec 2018, 02:25
Bunuel wrote:
A number is “terrific” if it is a multiple of 2 or 3. How many terrific numbers are there between –11 and 11?

A. 6
B. 7
C. 11
D. 15
E. 17



total 7 -ve and 7+ve np = 14 + 0 so 15

IMO D
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Re: A number is “terrific” if it is a multiple of 2 or 3. How many terrifi   [#permalink] 24 Dec 2018, 02:25
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