permutation_concept

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iwill: Master | Next Rank: 500 Posts; Posts: 164; Joined: Wed Jun 11, 2008 6:34 pm; Location: Bangalore; GMAT Score:590

by iwill » Mon Aug 31, 2009 9:15 am

Guys,

Can somebody explain the concept of box - letter concept.
Q. In how many ways can 8 letters be posted in 5 letter boxes ?

Thanks,
V

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Source: Beat The GMAT — Problem Solving | Mon Aug 31, 2009 9:15 am

quant-master: Senior | Next Rank: 100 Posts; Posts: 74; Joined: Fri Jul 31, 2009 11:38 amFollowed by: 1 member; Thanked: 4 times

Re: permutation_concept

by quant-master » Mon Aug 31, 2009 12:07 pm

iwill wrote:Guys,

Can somebody explain the concept of box - letter concept.
Q. In how many ways can 8 letters be posted in 5 letter boxes ?

Thanks,
V

Take letter 1 you can post it either in box 1 or 2 or 3 or 4 or 5 hence 5 ways
similarly letter 2 you can do it in 5 ways.....
letter 8 you can do it in 5 ways hence 5^8

Let me know if you have any questions

Thanks,
Quant-Master

https://gmat-quants.blocked - My Blog Updated almost daily with new quant fundas. Find collection of quants question in my blog

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