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assign1 q17

Posted by kiolb 
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avatar assign1 q17
March 18, 2008 10:00AM
Hello. To me none of the answers are correct.

Because none of them define all strings without bb.
In other words, most of them define strings without bb, but not all strings without bb.

avatar Re: assign1 q17
March 19, 2008 07:49AM

I looked at it again and there is an answer that is correct.

Sorry about that.

Re: assign1 q17
March 29, 2008 12:41PM
i think there a multiple correct answers here.

what seems unclear, is that:
"... the letter b is never doubled ..."
"... no word contains the substring bb ..."

does that mean bab can be a valid string ?
Re: assign1 q17
March 29, 2008 01:23PM
The question is clear.. just that the answers are ambiguous.. what they did last yr was when all assignments were handed in they sent out a tutorial letter saying that marks will be awarded for this question irrespective of the answer...because its a problem from their side.

The Surfer cool smiley
avatar Re: assign1 q17
April 02, 2008 09:50AM

To me bab should be a valid string. But not (bab)*, because this has babbab.

Re: assign1 q17
May 05, 2008 02:00PM
There is no problem with this question. Only one option is correct. Remember, 'all' strings in which the letter b is never doubled must be in the language.
Daphne Becker'
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