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right most non-zero

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right most non-zero

by sanju09 » Thu Aug 12, 2010 8:16 pm
The right most non-zero digit of 30^2720 is
(A) 1
(B) 3
(C) 6
(D) 7
(E) 9


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by selango » Thu Aug 12, 2010 9:39 pm
30^1=3

30^2=9

30^3=7

30^4=1

The pattern repeats from here.

2720/4 gives the remainder 0

Right most digit is 1.Pick A
Last edited by selango on Thu Aug 12, 2010 10:46 pm, edited 1 time in total.
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by sanju09 » Thu Aug 12, 2010 10:35 pm
selango wrote:30^1=3

30^2=9

30^3=7

30^4=1

The pattern repeats from here.

2047/4 gives the remainder 3

Right most digit is 7.Pick D
Where did you get 2047 from?
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by crackinggmat » Fri Aug 13, 2010 6:55 am
answewr is 1
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