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

Redeem

knewton t q 12

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1893
Joined: Sun May 30, 2010 11:48 pm
Thanked: 215 times
Followed by:7 members

by kvcpk » Tue Oct 19, 2010 9:53 pm
pradeepkaushal9518 wrote:Question #12 (correct)

If 4^w = n, what is the units digit of n?

w is an even integer
w > 0
4^w = n
4^1 = 4
4^2 = 16
4^3 = 64
..
Hence when w is odd positve, units digit is 4
when w is even positive, units digit is 6

When w is negative, units digit is always 0.

Hence pick C.
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)
Top
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Tue Oct 19, 2010 10:06 pm
kvcpk wrote:
pradeepkaushal9518 wrote:Question #12 (correct)

If 4^w = n, what is the units digit of n?

w is an even integer
w > 0
4^w = n
4^1 = 4
4^2 = 16
4^3 = 64
..
Hence when w is odd positve, units digit is 4
when w is even positive, units digit is 6

When w is negative, units digit is always 0.

Hence pick C.
Praveen,

I think its E.

W>0.

Still P unit's digit can be 4 or 6.

If it is mentioned that w is even or odd,the answer is C.

Please correct me if I am wrong.
--Anand--
Top
User avatar
Legendary Member
Posts: 1893
Joined: Sun May 30, 2010 11:48 pm
Thanked: 215 times
Followed by:7 members

by kvcpk » Tue Oct 19, 2010 10:09 pm
selango wrote: Praveen,

I think its E.

W>0.

Still P unit's digit can be 4 or 6.

If it is mentioned that w is even or odd,the answer is C.

Please correct me if I am wrong.
Didnt get you Anand.

Combining both:
W>0 and W is even.
So units digit should always be 6.

Am I missing something?
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)
Top
User avatar
Legendary Member
Posts: 1172
Joined: Wed Apr 28, 2010 6:20 pm
Thanked: 74 times
Followed by:4 members

by uwhusky » Tue Oct 19, 2010 10:11 pm
It's 4 only if w is odd, when w is even and positive, the unit digit is always 6.
Yep.
Top
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Tue Oct 19, 2010 10:40 pm
kvcpk wrote:
selango wrote: Praveen,

I think its E.

W>0.

Still P unit's digit can be 4 or 6.

If it is mentioned that w is even or odd,the answer is C.

Please correct me if I am wrong.
Didnt get you Anand.

Combining both:
W>0 and W is even.
So units digit should always be 6.

Am I missing something?
Oh sorry praveen,I misread the first statement.

Ya its C
--Anand--
Top
User avatar
Legendary Member
Posts: 1309
Joined: Wed Mar 17, 2010 11:41 pm
Thanked: 33 times
Followed by:5 members

by pradeepkaushal9518 » Wed Oct 20, 2010 12:19 am
i have also choosen E but oa is C
A SMALL TOWN GUY
Top
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Wed Oct 20, 2010 12:32 am
yes OA C only.Check praveen's post..
--Anand--
Top
Post new topic Post Reply
• Page 1 of 1