![]() Consider a class of 5 girls and 7 boys.If a, b and c are the greatest values of 19Cp, 20Cq and 21Cr respectively, then…?.If all the words (with or without meaning) having five letters, formed using the letters…?.The number of words that can be formed by using all the letters of the word PROBLEM only one is…?.If nCr−1=28, nCr=56 and nCr+1=70, then the value of r is equal to…?.Let A and B be two sets containing four and two elements respectively.n P r n ( n r) Combination Formula: A combination is the choice of r things from a set of n things without replacement. Permutation Formula: A permutation is the arrangements of r things from a set of n things without replacement. Let Tn be the number of all possible triangles formed by joining vertices of an n-sided regular…? It is just a way of selecting items from a set or collection.How many four digit numbers abcd exist such that a is odd, b is divisible by 3, c is even…?.Permutations are distinct from combinations, which is a selection of data from a group where order doesn't matter.It is possible to have multiple permutations from a single combination. To calculate the number of permutations, take the number of possibilities for each event and then multiply that number by itself X times, where X equals the.The main types of permutations are those with repetition and those without, although other less common types include permutations with multi-sets and circular permutations. As you observed (in a comment on a different answer), the number of 8-permutations of this multiset is equal to the number of 9-permutations.With a permutation, the order of numbers matters.A permutation is the number of ways a set can be arranged or the number of ways things can be arranged. ![]()
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