How many strings are there of four lowercase letters that have the letter x in them? which of the following answer is correct? 1) 1x26x26x26 = 2) please explain me
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Originally Posted by zpwnchen How many strings are there of four lowercase letters that have the letter x in them? which of the following answer is correct? 1) 1x26x26x26 = 2) please explain me is the number of four letters strings which contain at least one x. Is that what the question means. is the number of four letters strings which contain exactly one x.
Last edited by Plato; October 31st 2009 at 02:38 PM.
Originally Posted by Plato is the number of four letters strings which contain exactly one x. can you tell me why you multiply with 4? what is the concept behind?
You multiply by 4 because you have 4 ways to place x: x _ _ _ _ x _ _ _ _ x _ _ _ _ x
Originally Posted by zpwnchen can you tell me why you multiply with 4? what is the concept behind? Please note my edit. There are four places to put the one x.
Last edited by Plato; October 31st 2009 at 03:56 PM.
that makes sense! thank you
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