120 as we expected.
Alex, Betty, Carol, John pattern Alex John The result is: Alex, Betty,Carol, John Alex, Betty,John, Carol Alex, Carol,Betty, John Alex, Carol,John, Betty Alex, John,Betty, Carol Alex, John,Carol, Betty Betty, Alex,Carol, John Betty, Alex,John, Carol Betty, Carol,Alex, John Carol, Alex,Betty, John Carol, Alex,John, Betty Carol, Betty,Alex.Suppose that you are going to write one of these 4 digit combinations.Example: how many ways can Alex, Betty, Carol and John be lined up, with John after Alex.So a,e,f is accepted, but d,e,f is rejected.If order mattered, we would say select the first number (10 choices then the second (9 choices) then the third (8 choices).Finally you have 10 choices for the fourth digit and thus there are 10x10x10x possible 4 digit combinations from 0-9.Then a comma and a list of items separated by commas.
Example has 2,a,b,c, will allow if there is an a and b, or a and c, or b and c, or all three a,b and.
Question: I need all of the 4 digit combinations using the numbers 0-9.These are what are mathematically called "combinations".Do the digits have to be different?The formula for nCm is nCm n!Is 0234 a 4 digit combination?(10 x 9 x 8 x 7!) / (3 x 2 x 1) 7!Since you can repeat the digits the number of 4 digit combinations is relatively easy to calculate.The number says how many (minimum) from the list are needed for that result to be allowed.In other words, it insists there be at least 2 of a or b or c in the result.The word "no" resultat loto 13 novembre 2013 followed by a space and a number.So there would be 10 x 9 x 8 720 possible choices.But because order does not matter, we have to take care of duplicates as you mentioned.720 / 6 120.
Therefore in that set of 720 possibilities, each unique combination of three digits is represented 6 times.
The entries a,b,c, a,b,d and a,b,e are missing because the rule says we can't have 2 from the list a,b (having an a or b is fine, but not together) Example: no 2,a,b,c Allows only these: a,d,e b,d,e c,d,e It has rejected any with.
I need more information.