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# The pattern of stones shown is contained completely around the circula

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Math Expert
Joined: 02 Sep 2009
Posts: 46051
The pattern of stones shown is contained completely around the circula [#permalink]

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29 Nov 2017, 22:55
00:00

Difficulty:

25% (medium)

Question Stats:

88% (00:36) correct 12% (00:41) wrong based on 50 sessions

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The pattern of stones shown is contained completely around the circular bracelet so that the arc formed by joining the centers of any two adjacent stones is 45°. The number of stones on the bracelets is

(A) 5
(B) 6
(C) 8
(D) 10
(E) 12

Attachment:

2017-11-30_0949_002.png [ 41.07 KiB | Viewed 720 times ]

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Re: The pattern of stones shown is contained completely around the circula [#permalink]

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30 Nov 2017, 08:53
Bunuel wrote:

The pattern of stones shown is contained completely around the circular bracelet so that the arc formed by joining the centers of any two adjacent stones is 45°. The number of stones on the bracelets is

(A) 5
(B) 6
(C) 8
(D) 10
(E) 12

Attachment:
2017-11-30_0949_002.png

Each arc equals $$45°$$

Number of stones = number of arcs

So number of arcs = $$\frac{360°}{45°}=8$$

Option C
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The pattern of stones shown is contained completely around the circula [#permalink]

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Updated on: 03 Dec 2017, 21:22
1
A very valuable point to note here is that when there are stones arranged in a straight line there would be n-1 segments .
But when they are connected in circle there would be as many segments as stones .
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Originally posted by arvind910619 on 01 Dec 2017, 08:24.
Last edited by arvind910619 on 03 Dec 2017, 21:22, edited 1 time in total.
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Joined: 01 Feb 2017
Posts: 136
Re: The pattern of stones shown is contained completely around the circula [#permalink]

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02 Dec 2017, 15:10
In my opinion, it's best to imagine the entire ring and manually count the stones, just to avoid any calculation error.

There are 8 stones on the ring.

Ans C

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Re: The pattern of stones shown is contained completely around the circula [#permalink]

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02 Dec 2017, 19:21
Shobhit7 wrote:
In my opinion, it's best to imagine the entire ring and manually count the stones, just to avoid any calculation error.

There are 8 stones on the ring.

Ans C

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Hi @Shobhit

Can you explain How one can imagine and manually calculate the number of stones without knowing the angle between them or without knowing that the stones are equally spaced?

If the angel between the stones would have been 10 then there would have been 36 stones are if the stones were not equally spaced then the number could have been different.

I think you need to know the number of sectors first and the may be visualise the ring with all sectors and stones on it

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Re: The pattern of stones shown is contained completely around the circula [#permalink]

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03 Dec 2017, 01:40
niks18 wrote:
Shobhit7 wrote:
In my opinion, it's best to imagine the entire ring and manually count the stones, just to avoid any calculation error.

There are 8 stones on the ring.

Ans C

Posted from my mobile device

Hi @Shobhit

Can you explain How one can imagine and manually calculate the number of stones without knowing the angle between them or without knowing that the stones are equally spaced?

If the angel between the stones would have been 10 then there would have been 36 stones are if the stones were not equally spaced then the number could have been different.

I think you need to know the number of sectors first and the may be visualise the ring with all sectors and stones on it

Sent from my iPhone using GMAT Club Forum mobile app

Hi,

What I meant was, considering the data in the given figure, we know that there are 8 equally spaced sectors of 45 degrees each. Basis, we can imagine the ring and manually count the stones as well. This is just to avoid double counting any stone that's part of two adjacent sectors.

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Re: The pattern of stones shown is contained completely around the circula [#permalink]

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06 Dec 2017, 19:25

360/45 = 8
Re: The pattern of stones shown is contained completely around the circula   [#permalink] 06 Dec 2017, 19:25
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