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yessuresh
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Here is my collection of Quant questions from the 4GMAT.com 14 Sep 2006, 20:11
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Here is my collection of Quant questions from the 4GMAT.com website.



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vshaunak@gmail.com
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 04:53
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Thanks for posting this precious doc.
Keep posting good stuff.
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Summer3
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 06:20
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Quote:

How many zeros will be there in the value of 25!?

A. 25
B. 8
C. 6
D. 5
E. 2

The correct choice is (C) and the correct answer is 6.
Explanatory Answer
25! is factorial 25 whose value = 25*24*23*22*…..*1

When a number that has 5 as its factor is multiplied by another number that has 2 as its factor, the result will have ‘0’ in its units digit.

In 25!, the numbers that have 5 as their factor are 5, 10, 15, 20, and 25. 25 is the square of 5 and hence has two 5’s in it.

Therefore, 25! contains in it 6 fives.
There are more than 6 even numbers in 25!. Hence, the limiting factor is the number of 5s.

And hence, the number 25! will have 6 zeroes in it.
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Here is one question from this document and I found its answer wrong there.

25! = 1.551121 × 10^(25)

How can it say that the number 25! will have 6 zeroes in it.
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Summer3
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 06:21
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Quote:

How many zeros will be there in the value of 25!?

A. 25
B. 8
C. 6
D. 5
E. 2

The correct choice is (C) and the correct answer is 6.
Explanatory Answer
25! is factorial 25 whose value = 25*24*23*22*…..*1

When a number that has 5 as its factor is multiplied by another number that has 2 as its factor, the result will have ‘0’ in its units digit.

In 25!, the numbers that have 5 as their factor are 5, 10, 15, 20, and 25. 25 is the square of 5 and hence has two 5’s in it.

Therefore, 25! contains in it 6 fives.
There are more than 6 even numbers in 25!. Hence, the limiting factor is the number of 5s.

And hence, the number 25! will have 6 zeroes in it.
Show more


Here is one question from this document and I found its answer wrong there.

25! = 1.551121 × 10^(25) means 25 zeros in it.

Then how can it say that the number 25! will have 6 zeroes in it?
:?
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Summer3
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 06:32
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OR

25! = 1.551121 * 10^(25) = 1551121 * 10^(19)

Any help???
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milmerry
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 23:01
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Hi Summer3,

The exact value is:

15511210043330985984000000.

You are adding zero's after rounding off.

Thanks a lot yessuresh for the quant problems.
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Amardeep Sharma
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Here is my collection of Quant questions from the 4GMAT.com 28 Mar 2007, 23:50
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Good posting suresh, Thanks a lot

regards,

Amardeep
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Summer3
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Here is my collection of Quant questions from the 4GMAT.com 29 Mar 2007, 02:58
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I did google to get the value of 25!

Hmmm.....so google is here to blame :)
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thinktank
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Here is my collection of Quant questions from the 4GMAT.com 22 Mar 2013, 08:20
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25! contains 25/5+25/5^2 = 5+1 = 6

Hope this helps :)



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!