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Submit Your Own GMAT Math Questions - Get GMAT Club Tests

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Expert Post
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Joined: 21 Feb 2012
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Re: Submit Your Own GMAT Math Questions - Get GMAT Club Tests [#permalink] New post 26 Aug 2013, 09:16
Expert's post
swati007 wrote:
How many zeros exist in the end of the product of alphabets(a-z) where a = 4^4, b = 5^5, c = 6^6, ....z = 29^29?

a) 99
b) 100
c) 101
d)102
e)103


I think, It is 100.

A zero is created when 2 is multiplied by 5. So we should find out how many multiplications of 2 and 5 are possible in the expression.
Obviously 2 will occur more frequently than does 5. So number of 5 in the above expression will determine the number of zeros.

5 can be found in following terms

5^5 = 5 times

10^10 = 10 times

15^15 = 15 times

20^20 = 20 times

25^25 = 50 times

Total = 100 times. So 100 zeros should be there.
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Re: Submit Your Own GMAT Math Questions - Get GMAT Club Tests [#permalink] New post 26 Aug 2013, 09:28
thats right...
is the competition closed now? i didnt see any kudos to latest posts..
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Expert Post
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Affiliations: GMAT Club
Joined: 21 Feb 2012
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Re: Submit Your Own GMAT Math Questions - Get GMAT Club Tests [#permalink] New post 26 Aug 2013, 09:36
Expert's post
swati007 wrote:
thats right...
is the competition closed now? i didnt see any kudos to latest posts..


It's closed quite long back
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Re: Submit Your Own GMAT Math Questions - Get GMAT Club Tests [#permalink] New post 26 Aug 2013, 19:59
Narenn wrote:
swati007 wrote:
thats right...
is the competition closed now? i didnt see any kudos to latest posts..


It's closed quite long back


When did it start and when did it close? No Information is provided on the thread at all.
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Re: Submit Your Own GMAT Math Questions - Get GMAT Club Tests   [#permalink] 26 Aug 2013, 19:59
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