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zagcollins: Master | Next Rank: 500 Posts; Posts: 167; Joined: Wed Jun 11, 2008 10:58 pmFollowed by: 1 member; Thanked: 2 times

by zagcollins » Mon Jul 28, 2008 2:46 am

2^(4-1)^2/2^3-2

A.2^8
B.2^7
C.2^6
D.2^5
E.2^4

OA is A

Last edited by zagcollins on Tue Jul 29, 2008 3:07 am, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Mon Jul 28, 2008 2:46 am

sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

by sudhir3127 » Mon Jul 28, 2008 2:49 am

IMO its 2^8.

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parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Mon Jul 28, 2008 3:10 am

2^(4-1)^2 = 2^9

2^(3-2) = 2

2^9/2 = 2^8

Hence A.

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ricky: Master | Next Rank: 500 Posts; Posts: 118; Joined: Sun Jun 01, 2008 1:47 pmFollowed by: 1 member; Thanked: 5 times

by ricky » Mon Jul 28, 2008 3:11 am

Is It A....?

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malolakrupa: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Fri Jul 18, 2008 12:26 pm; Thanked: 2 times

by malolakrupa » Mon Jul 28, 2008 7:36 am

I think the answer is 2^ 5 .

2^ (4-1) = 2^ 3
2^(4-1)^ 2= (2^3)^2 = 2^6

Denominator evaluates to 2 . hence the answer is 2^5

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parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Mon Jul 28, 2008 8:24 am

malolakrupa wrote:I think the answer is 2^ 5 .

2^ (4-1) = 2^ 3
2^(4-1)^ 2= (2^3)^2 = 2^6

Denominator evaluates to 2 . hence the answer is 2^5

2^(4-1)^2 = 2^9

but

[2^(4-1)]^2= 2^6

Let me know if you think otherwise.

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

by sudhir3127 » Mon Jul 28, 2008 8:39 am

I agree parallel...

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malolakrupa: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Fri Jul 18, 2008 12:26 pm; Thanked: 2 times

by malolakrupa » Mon Jul 28, 2008 9:21 am

thanks parallel_chase. I see what you mean.

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hakyology: Senior | Next Rank: 100 Posts; Posts: 66; Joined: Tue Jun 05, 2007 1:39 pm; Thanked: 1 times

i think the answer is 2^6

by hakyology » Mon Jul 28, 2008 9:25 am

i think the answer is 2^6

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