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Author Message
Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Technology, Entrepreneurship
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
GMAT 10: 740 Q V
GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
WE: Engineering (Manufacturing)
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Kudos [?]: 202 [0], given: 102363

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05 Jun 2004, 12:08
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

can someone explain simplest way to do this?

What is the tens digit of 321^4?
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Joined: 02 Mar 2004
Posts: 327
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05 Jun 2004, 21:40
321^4 = 21^4 = (441)^2 = 41^2 = 81 (mod 100)

10's digit = 8
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06 Jun 2004, 05:10
Bhai wrote:
hallelujah1234 wrote:
321^4 = 21^4 = (441)^2 = 41^2 = 81 (mod 100)

10's digit = 8

What is mod 100 ?

mod 100 means to divide by 100 without having fraction part, so 321^4 mod 100 would give the remainder which is = 81.

Look at example:
5/2=2.5
5 mod 2 = 2 and 1 is remainder.
Re: question   [#permalink] 06 Jun 2004, 05:10
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