BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Q5

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 245
Joined: Thu Aug 16, 2007 12:41 pm

Q5

by bacali » Mon Dec 01, 2008 3:31 pm
If k=-1, which of the following is (are) true?
1. k^k=k
2. | k| =-k.
3.k^0=-k


A. 1 only

B. 1 and 2 only

C. 1 and 3 only

D. 2 and 3 only

E. 1. 2. and 3.


OA: E [/spoiler]
Top
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Tue Sep 02, 2008 5:34 pm
Thanked: 7 times

Re: Q5

by hwiya320 » Mon Dec 01, 2008 5:13 pm
bacali wrote:If k=-1, which of the following is (are) true?
1. k^k=k
2. | k| =-k.
3.k^0=-k

1. -1^-1= which means -1 divided by 1, which gives you -1, so correct
absolute value of -1 = 1, but it says negative of -1, which means positive. -(-2. 1)=1, so correct
3. -1^0 = 1, again, -(-1) = 1, so correct. anything to 0 power is 1.

so all of them are correct.
Top
Post new topic Post Reply
• Page 1 of 1