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# If (243)^x(463)^y = n , where x and y are

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Manager
Joined: 04 Jan 2008
Posts: 118
If (243)^x(463)^y = n , where x and y are [#permalink]

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13 Sep 2008, 01:49
00:00

Difficulty:

(N/A)

Question Stats:

33% (00:00) correct 67% (00:16) wrong based on 6 sessions

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If $$(243)^x(463)^y = n$$, where x and y are positive integers, what is the units digit of n?

(1) x + y = 7
(2) x = 4

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-243-x-463-y-n-where-x-and-y-are-positive-integers-102054.html
[Reveal] Spoiler: OA
VP
Joined: 17 Jun 2008
Posts: 1373

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14 Sep 2008, 00:52
dancinggeometry wrote:
If $$(243)^x(463)^y = n$$, where x and y are positive integers, what is the units digit of n?

(1) x + y = 7
(2) x = 4

(1) is sufficint to prove since we wnt 3^x * 3^y =3^(x+y)

(2) INSUFFI
IMO A
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Its Now Or Never

Senior Manager
Joined: 07 Jan 2008
Posts: 397

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14 Sep 2008, 01:24
Unit digit of n = 7.
Re: Zumit DS 024   [#permalink] 14 Sep 2008, 01:24
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