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25 Nov 2008, 22:06
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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%
Pl help me to solve this,
a) 5%
b) 10%
c) 20%
d) 25%
Pl help me to solve this,
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25 Nov 2008, 23:08
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vivektripathi
My choice is B (not sure).
The number of interchanged names equals to the number of combinations that you take 2 out of the 5 letters to interchange. (5C2 = 10)
So there will be 10 combinations or 10 interchanged names.
There is only 1 combination (interchange 2 Es) the name is still the same.
=> The probability is 1/10= 10% (not sure)
26 Nov 2008, 00:09
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10%
total interchanges possible = 5C2 = 10
no of interchanges in which name does not change = 1 (E interchanged with E)
so P= (1/10)*100 = 10%
total interchanges possible = 5C2 = 10
no of interchanges in which name does not change = 1 (E interchanged with E)
so P= (1/10)*100 = 10%
