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Senior Manager
Joined: 08 Aug 2005
Posts: 251

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24 Nov 2005, 02:20
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If k^4 is divisible by 32, which of the following could be the remainder when k is divided by 32?

(1). 2
(2). 4
(3). 6
Director
Joined: 14 Sep 2005
Posts: 985
Location: South Korea

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24 Nov 2005, 02:27
if k = 2, k^4 = 16 (not divisible by 32)
if k = 4, k^4 = 256 (divisible 32)
if k = 6, k^4 = 1296 (not divisible by 32)

Thus only 4 can be the remainder.
_________________

Auge um Auge, Zahn um Zahn !

Director
Joined: 13 Nov 2003
Posts: 789
Location: BULGARIA

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24 Nov 2005, 02:31
32=2^5 so if 8^4=2^12=2^5x2^5x2^2 is divided by 2^5 it will have reminder 2^2 or 4
SVP
Joined: 28 May 2005
Posts: 1707
Location: Dhaka

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24 Nov 2005, 02:36
gamjatang wrote:
if k = 2, k^4 = 16 (not divisible by 32)
if k = 4, k^4 = 256 (divisible 32)
if k = 6, k^4 = 1296 (not divisible by 32)

Thus only 4 can be the remainder.

agreed. 4 should be the answer.
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hey ya......

SVP
Joined: 24 Sep 2005
Posts: 1885

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24 Nov 2005, 02:36
getzgetzu wrote:
If k^4 is divisible by 32, which of the following could be the remainder when k is divided by 32?

(1). 2
(2). 4
(3). 6

let k= 32m + r ( r is the remainder)
k^4= ( 32m+r)^4 ...we know if spreading this expresion we'll get only one term which is not a multiple of 32m ...that is r^4
since k^4 is divisible by 32 ----> r^4 must be divisible by 32
try those choices provided...only 4 satisfies.
4 is correct.
Senior Manager
Joined: 08 Aug 2005
Posts: 251

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24 Nov 2005, 02:43
Laxi your responses are stunning! You make things just way too simple! I am absolutely overawed. And Thank You so much.....
Director
Joined: 14 Sep 2005
Posts: 985
Location: South Korea

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24 Nov 2005, 02:46
getzgetzu wrote:
Laxi your responses are stunning! You make things just way too simple! I am absolutely overawed. And Thank You so much.....

getzgetzu/ You may join us. We have a fan club for Laxi.
_________________

Auge um Auge, Zahn um Zahn !

Senior Manager
Joined: 08 Aug 2005
Posts: 251

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24 Nov 2005, 02:50
And you are no less great than her gamjatang......
SVP
Joined: 24 Sep 2005
Posts: 1885

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24 Nov 2005, 02:54
getzgetzu wrote:
And you are no less great than her gamjatang......

yes,o bba is great
24 Nov 2005, 02:54
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