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What is the tenth digit to the right of the decimal point

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What is the tenth digit to the right of the decimal point [#permalink] New post 18 Feb 2011, 02:37
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A
B
C
D
E

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Question Stats:

46% (02:03) correct 54% (01:06) wrong based on 244 sessions
What is the tenth digit to the right of the decimal point, in the decimal expansion of (1/5)^10
(A) 0
(B) 2
(C) 4
(D) 6
(E) 8
[Reveal] Spoiler: OA

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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 18 Feb 2011, 03:41
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(\frac{1}{5})^{10}

\frac{1}{5^{10}}

\frac{1}{(\frac{10}{2})^{10}}

\frac{2^{10}}{{10}^{10}}

\frac{1024}{{10}^{10}}

1024*10^{-10}

.0000001024

Tenth digit to the right of decimal is 4.

Ans: "C"
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 30 Nov 2011, 03:53
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Expert's post
feruz77 wrote:
Hi fluke,

but, inasmuch as I know tenth digit to the right of the decimal point is a first number after the decimal point. Please correct if I am wrong!


You are talking about the 'tenths' digit which is right after the decimal point.
'The tenth digit to the right of the decimal' is the digit that appears after 9 digits to the right of the decimal point.
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 30 Nov 2011, 04:43
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(1/5)^10 is (0.2)^10

we know that 2^5=32 .we have (2^5) *(2^5) or 32*32=1024 since we have 10 zeros , our result is
0.0000001024

so 10th digit is 4
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 18 Feb 2011, 04:38
(1/5)^10 is same as (2/10)^10. 10th digit after decimal in this is same as unit's digit in 2^10
2^10 = 2^5*2^5 - 32*32 whose units digit would be 4
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 30 Nov 2011, 03:09
Hi fluke,

but, inasmuch as I know tenth digit to the right of the decimal point is a first number after the decimal point. Please correct if I am wrong!
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 30 Nov 2011, 04:52
VeritasPrepKarishma wrote:
feruz77 wrote:
Hi fluke,

but, inasmuch as I know tenth digit to the right of the decimal point is a first number after the decimal point. Please correct if I am wrong!


You are talking about the 'tenths' digit which is right after the decimal point.
'The tenth digit to the right of the decimal' is the digit that appears after 9 digits to the right of the decimal point.



Hi Karishma,

Thanks for reply. Such kind of things make GMAT very tricky. I appreciate your help.
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 30 Nov 2011, 22:31
I made a silly mistake...
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Re: Powers PS: Manhattan GMAT Challenge Problem Showdown [#permalink] New post 12 Dec 2011, 22:47
Hi Karishma,
Thanks for making it clear . very confusing language.
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Re: What is the tenth digit to the right of the decimal point [#permalink] New post 27 Dec 2013, 21:45
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Re: What is the tenth digit to the right of the decimal point [#permalink] New post 28 Dec 2013, 03:06
Expert's post
gmatpapa wrote:
What is the tenth digit to the right of the decimal point, in the decimal expansion of (1/5)^10
(A) 0
(B) 2
(C) 4
(D) 6
(E) 8


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Re: What is the tenth digit to the right of the decimal point [#permalink] New post 30 Dec 2013, 13:30
gmatpapa wrote:
What is the tenth digit to the right of the decimal point, in the decimal expansion of (1/5)^10
(A) 0
(B) 2
(C) 4
(D) 6
(E) 8


Yeah actually 1/5 = 0.2 = 2*10^-1

so 2^10 * 10^-10

2 has sequence 2,4,8,6.

Hence digit will be 4

Answer is C

Hope it helps

Cheers!
J :)
Re: What is the tenth digit to the right of the decimal point   [#permalink] 30 Dec 2013, 13:30
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