Question

How many strings over alphabet Ʃ = {a,b} are there a) of length 5? b) of...

How many strings over alphabet Ʃ = {a,b} are there

a) of length 5?

b) of length at most 5?

c) of length ??

d) of length at most ??

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
n digit string of length n over alphabet {0,1, . . . ,9} a. How many...
n digit string of length n over alphabet {0,1, . . . ,9} a. How many n digit strings are there with at least one 1? b. many n digit are there with EXACTLY one 1? PLEASE ANSWER BOTH AND INCLUDE THE FACT THAT THE STRING IS OVER ALPHABET {0,1,2,3,4....9}
n digit string of length n over alphabet {0,1, . . . ,9} How many n...
n digit string of length n over alphabet {0,1, . . . ,9} How many n digit strings are there with at least one 1? How many n digit are there with EXACTLY one 1?
Consider mini-alphabet made of just letters {a, b, c, d, e}. How many “words” (i.e., strings...
Consider mini-alphabet made of just letters {a, b, c, d, e}. How many “words” (i.e., strings of letters from that alphabet, whether they correspond to meaningful words or not) are there of length n, for n≥1 ? Use mathematical induction to prove your answer.
how many strings of length 14 of lower case letters from the English alphabet can be...
how many strings of length 14 of lower case letters from the English alphabet can be formed, if the first two letters cannot Abe both vowels and the last letter must be a consonant?
Find a regular expression to describe: The set of all strings over the alphabet {a, b,...
Find a regular expression to describe: The set of all strings over the alphabet {a, b, c, d} that contain exactly one a and exactly one b So, for example, the following strings are in this language: ab, ba, cccbad, acbd, cabddddd, ddbdddacccc and the following strings are NOT in this language: a, ccbc, acbcaaacba, acacac, bcbbbbbca, aca, c, d, b
how many strings of 7 lower case letters from the wnglish alphabet contain the letter a?...
how many strings of 7 lower case letters from the wnglish alphabet contain the letter a? How many strings of 7 lower case letters from the english alphabet contain the letter a and b?
how many strings of 8 lower case letters from the English alphabet contain the letter a?...
how many strings of 8 lower case letters from the English alphabet contain the letter a? how many strings if 8 lower case letter from the english alphabet contain the letter a and b?
Let letters A,B,C,D,E,F,G be used to form strings of length 4. How many strings of length...
Let letters A,B,C,D,E,F,G be used to form strings of length 4. How many strings of length 4 with repetitions contain A and B. How about without repetitions?
Discrete Math a.) How many bit strings are there of length five or less, not counting...
Discrete Math a.) How many bit strings are there of length five or less, not counting the empty string? b.) How many different three-letter initials with none of the letters repeated can people have? c.) How many different three-letter initials are there that begin with the letter B? d.) How many 5-element DNA sequences end with A? e.) How many bit strings of length nine both begin and end with 1?
Problem 5 Regular Expressions. a) Define a regular expression for all strings of odd length, over...
Problem 5 Regular Expressions. a) Define a regular expression for all strings of odd length, over the alphabet of {0}. b) Define a regular expression for identifiers over the alphabet of {A,B,C,a,b,c,0,1,2,3,4,5,6,7,8,9}, such that an identifier must begin with an alphabetic character and must contain at least one numeric character. c) Try to modify the definition above so that identifiers still begin with an alphabetic character, but after that, it must contain at least one numeric, at least one lower-case...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT