WebA typical combination lock for example, should technically be called a permutation lock by mathematical standards, since the order of the numbers entered is important; 1-2-9 is not … WebDec 8, 2012 · ∙ 2012-12-08 10:28:38. This answer is: ... How many 3 digit combinations are there in 1 to 21? I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.
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WebThe combination of any of them can give origin to dual and even multiporosity behavior. Included in the pore size are megaporosity, macroporosity, mesoporosity, and microporosity. Table 1 shows typical petrophysical parameters for this classification adapted from a combination of Coalson et al. (9), and White(10). WebA combination is any set or subset of items, regardless of their internal order. Combinations are distinct from permutations, for which the internal order is significant. The number of … WebFormula: Note: , where n P r is the formula for permutations of n objects taken r at a time. Example: How many different committees of 4 students can be chosen from a group of 15? Answer: There are possible combinations of 4 students from a set of 15.: There are 1365 different committees. greenpow crypto