-1
votes
1answer
25 views

Question in permutations

When we use this law? And in any case we use it? Thank you and I wish clarification.
1
vote
2answers
23 views

Combination problem with distributing

I've been trying to do last exercise, but I can't figure out method to solve it. I read a book and searched for it in the internet, but I couldn't find exactly what I am looking for. Could you guys ...
0
votes
1answer
18 views

Distribution combinations

How many ways can 25 identical pencils be distributed between two people?.Each all pencils must be shared out. A) Each person must have at least 5 pencils? B) Each person must have at least 7 ...
0
votes
0answers
30 views

Comparing test statistics and/or $p$-values from multiple permutation (Mantel) tests on non-independent data

I am comparing the relationship between genetic and geographic distance of individuals in a wild animal population. The hypothesis is that individuals with higher genetic relatedness establish home ...
0
votes
1answer
251 views

Calculating the expected profit with Probability A level maths CIE

Company sets up display of 20 fireworks! for each firework, the probability that it fails is 0.05,independently of other fireworks the probability that more than 1 firework fails is 0.264 the 20 ...
0
votes
0answers
36 views

Calculating the probabilities of different lengths of repetitions of numbers of length 6

This question is similar to the question I asked here: Calculating the probabilities of different lengths of repetitions of numbers of length 4 except now I'm having problem with numbers of length 6. ...
0
votes
1answer
59 views

Is there a known distribution for this permutation with replacement problem? [duplicate]

Choose $t$ numbers from $n$ $(n>t)$ distinct numbers with replacement and the order of the $t$ numbers matters. Say, $P(X=1) = \dfrac{{numbers\ of\ unique\ t-set \ which\ has\ 1\ distinct\ ...
1
vote
6answers
874 views

Why is the number of possible subsequences $2^n$?

If anyone here is familiar with the Lowest Common Subsequence problem, they probably know that the number of posibble subsequences in a sequence is $2^n$; $n$ being the length of the sequence. ...