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Re: In how many different ways can 10 students of a class with roll number [#permalink]
Expert Reply
adewale223 wrote:
There are 5 odd numbers and 5 even numbers from 1 to 10 so first slot will take 5 for odd and last slot will take 5 for even

Second slot will take 8 and so on

5x8x7x6x5x4x3x2x1x5

But there are 2 of such possibilities so

5x8x7x6x5x4x3x2x1x5x2

Which will give 50x8!

Answer C

Adewale Fasipe, GRE, GMAT quant instructor from Lagos, Nigeria.


Thank you for your contribution sir. We are eager an instructor is part of this community

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Re: In how many different ways can 10 students of a class with roll number [#permalink]
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