Table of Contents
- 1 How many strings of 5 letters contains at least once?
- 2 How many 5 letter strings are there?
- 3 How many 5 letter words can be formed from the alphabet if we require at least one standard vowel a e i/o u?
- 4 How many letters of the alphabet cannot repeat?
- 5 What is the total number of combinations of 5 letters?
How many strings of 5 letters contains at least once?
The correct solution is as follows: The number of 5-character ASCII strings is 128^5. The number of 5-character ASCII strings not including at least one @ is 127^5. By the inclusion-exclusion principle, the number of 5-character ASCII strings including at least one @ is equal to 128^5 – 127^5.
How many 5 letter strings are there?
Total possible 5-letter words formed from letters a,b,c: = 3*3*3*3*3= 243.
How many 5 letter words can be formed from the alphabet if we require at least one standard vowel a e i/o u?
Question: How many 5-letter words can be formed from the alphabet if we require at least one “standard” vowel (a, e, i, o, u)? O (5)(264) = 2, 284, 880 (5)(5)(214) = 4,862, 025 265 – 215 = 7,797, 275 265 = 11,881, 376.
How many 5-letter words can be made from a 3-letter set?
There are 5-letter words made from a set of 3 letters. We then choose 1 letter ( choices to make here) and subtract out the two letter words that can be made without this letter. Now all 1-letter words have been subtracted out twice, so we must add 1 copy of each back in to compensate – for a total of words with each letter at least once.
How many different 4-letter codes are there?
How many different 4-letter codes are there if only the letters A, B, C, D, E, F, G, H, and I can be used and no letter can be used more than once? This is actually a simple question dealing with factorials but I’ll explain it anyways. So there are 9 letters that you can choose from to create a 4 digit pattern.
How many letters of the alphabet cannot repeat?
Among those four different letters, choose one which repeats twice. If two letters repeat, we need to choose 3 letters. Of those three different letters, choose two. If three letters repeat, we’ll end up with more than five letters. So three letters cannot repeat. From this, the answer can easily be concluded.
What is the total number of combinations of 5 letters?
The 5 letter combinations can take the following forms (please note that we are only talking about combinations and not the ordering of alphabets) – Therefore total no.of combinations = 8C5 + 8C4X4 + 8C3X3 = 56 + 280 + 168 = 504…Answer Study economics for business with MIT.