Wednesday, November 30, 2011
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Join Date: Feb 2010
Location: Karachi
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Quote:
Originally Posted by fouzia23
How many words can be formed from the letters of the word "PLANE" using all letters when no letter is to be repeated.?
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in my view this will be done like this,
there are five different letters in word PLANE, therefore
in first place you can use all 5 letters,
in second place you can use remaining 4 letters (as repetition not allowed)
like wise at third place we can use 3 letters, 2 letters in fourth place and 1 letter in fifth place...
so, 5x4x3x2x1=120 is the answer,
or you can use Permutation formula as well, which is
P = n! / (n1! x n2! x n3! x n4! x n5!)
in this word none of the letter is repeated therefore n1=n2=n3=n4=n5 = 1
I hope this will clear your problem, and if at any place I am wrong do correct me.
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Regards,
~ Riz ~
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