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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."
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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--
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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."
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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.
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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
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by pradeepkaushal9518 » Wed Oct 20, 2010 12:19 am
i have also choosen E but oa is C
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by selango » Wed Oct 20, 2010 12:32 am
yes OA C only.Check praveen's post..
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