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My name is AJEET. But my son accidentally types the name by

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My name is AJEET. But my son accidentally types the name by [#permalink] New post 10 Nov 2007, 21:53
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115. My name is AJEET. But my son accidentally types the name by interchanging a pair of letters in my name. What is the probability that despite this interchange, the name remains unchanged?

a) 5%
b) 10%
c) 20%
d) 25%
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 [#permalink] New post 10 Nov 2007, 22:58
This is a very crude method but i guess it's effective for such small problems.

Possible pairs of letters that could be interchanged are:

AJ
AE
AE
AT
JE
JE
JT
EE
ET
ET

Out of the the ten possibilities, only 1 would lead to an unchanged name.
Therefore, the probability is 1/10 = 10 %.

A more general approach goes as follows:

Each letter can be interchanged in the following ways.

'A' can be interchanged with 4 letters,' 'J' with 3, 'E' with 2 and 'E' with 1.

Therefore total possibilities equal 4+3+2+1=10.

Again only 1 would lead to an unchanged name.

Therefore the answer is 1/10 =10%
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 [#permalink] New post 15 Nov 2007, 01:08
jbs wrote:
This is a very crude method but i guess it's effective for such small problems.

Possible pairs of letters that could be interchanged are:

AJ
AE
AE
AT
JE
JE
JT
EE
ET
ET

Out of the the ten possibilities, only 1 would lead to an unchanged name.
Therefore, the probability is 1/10 = 10 %.

A more general approach goes as follows:

Each letter can be interchanged in the following ways.

'A' can be interchanged with 4 letters,' 'J' with 3, 'E' with 2 and 'E' with 1.

Therefore total possibilities equal 4+3+2+1=10.

Again only 1 would lead to an unchanged name.

Therefore the answer is 1/10 =10%


It's nice :)

BTW, I think picking a pair to interchange its members is like picking 2 out of 5 letters, thus C(5,2) ( We dont care their order anyways)
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Re: probability [#permalink] New post 26 Aug 2008, 13:51
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Balvinder wrote:
115. My name is AJEET. But my son accidentally types the name by interchanging a pair of letters in my name. What is the probability that despite this interchange, the name remains unchanged?

a) 5%
b) 10%
c) 20%
d) 25%


= (No of ways to chose two letter for exchangefrom{EE}) /(No of ways to chose two letter for exchange from{AJEET})
=2C2/5C2 = 1/10=10%
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Re: probability [#permalink] New post 26 Aug 2008, 17:32
whts the OA ?


i think answer shud be 20%

i divided the 5C2 by 2 as there are 2 E's and hence pairs wud get repeated but the Name wudnt change

as in even if the boy replaces A with first E or the second E , the Name remains the same .
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Re: probability [#permalink] New post 26 Aug 2008, 17:34
ok i think i got where i made the mistake :P

answer shud be 10%
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Re: probability [#permalink] New post 28 Sep 2009, 10:45
115. My name is AJEET. But my son accidentally types the name by interchanging a pair of letters in my name. What is the probability that despite this interchange, the name remains unchanged?

a) 5%
b) 10%
c) 20%
d) 25%

Soln: The total number of ways in which two letters can be interchanged and we get a new five letter words is 10 ways.

Of these 10 possible five letter words, the only interchange where the name does not change is when the E's are interchanged.

Thus probability is = (1/10) * 100 = 10%

Ans is B
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Re: probability [#permalink] New post 08 Jan 2010, 21:56
is my approach correct?
I read the question as, what is the prob. to choose EE from AJEET, then,
2/5*1/4=1/10 ==> 10% ?
thanks.
Re: probability   [#permalink] 08 Jan 2010, 21:56
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