For example, a true combination lock would accept both 170124 and 24. The order you put in the numbers of lock matters. Famous joke for the difference is: A combination lock should really be called a permutation lock. We will even show you the permutation and combinations examples. Hence, Permutation is used for lists (order matters) and Combination for groups (order doesn’t matter). If the permutations and combinations formula still seems confusing, don't worry just use our calculator for the calculations. 1st prize 100 2nd prize 5 b) How many ways can two identical movie tickets be awarded to a class of 5 students Topic Notes Permutation vs. The number of possible combinations, nCr, is 7! / 4! * (7 - 4)! = 35. This can be calculated using the combination formula:
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