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# How many 8-letter words can be created using computer

Author Message
Senior Manager
Joined: 02 Dec 2007
Posts: 450

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How many 8-letter words can be created using computer [#permalink]

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27 Aug 2008, 08:50
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

. How many 8-letter words can be created using computer language (0/1 only)?

a) 16
b) 64
c) 128
d) 256
e) 512

Kudos [?]: 290 [0], given: 6

Manager
Joined: 15 Jul 2008
Posts: 205

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27 Aug 2008, 09:54
x2suresh wrote:
Nihit wrote:
. How many 8-letter words can be created using computer language (0/1 only)?

a) 16
b) 64
c) 128
d) 256
e) 512

$$2^8 =128$$

2^8 = 256

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SVP
Joined: 07 Nov 2007
Posts: 1792

Kudos [?]: 1061 [0], given: 5

Location: New York

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27 Aug 2008, 09:55
bhushangiri wrote:
x2suresh wrote:
Nihit wrote:
. How many 8-letter words can be created using computer language (0/1 only)?

a) 16
b) 64
c) 128
d) 256
e) 512

$$2^8 =128$$

2^8 = 256

I KNOW .. I will be famous for silly mistakes
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Manager
Joined: 22 Jul 2008
Posts: 146

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27 Aug 2008, 10:33
8 C 0 + 8 C 1 + 8 C 2 + ...........+ 8 C 8 = 2^8 = 256

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Current Student
Joined: 11 May 2008
Posts: 555

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27 Aug 2008, 18:26
how come we dont have to divide???
usually we divide by no. of similar things right??
out of 5 cars 2 are blue and 3 are red. how many ways can we arrange?
5!/(2!*3!).
so why not here?

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Intern
Joined: 18 May 2008
Posts: 1

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27 Aug 2008, 22:03
arjtryarjtry wrote:
how come we dont have to divide???
usually we divide by no. of similar things right??
out of 5 cars 2 are blue and 3 are red. how many ways can we arrange?
5!/(2!*3!).
so why not here?

Each letter has 2 ways to write (either 0 or 1). Because there are 8 letters, numbers of words are 2^8

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Re: 8 letter word   [#permalink] 27 Aug 2008, 22:03
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