Factorial Combination

Probability Level 1

Suppose you take 5 different symbols. How many different (5 symbol) sequences can be made out of the 5 symbols if the order does not matter?


The answer is 120.

Walton Primo by Walton Primo , 30, Bangladesh

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1 solution

Walton Primo
Jun 1, 2018

The answer is 5!. i.e, 5!= 5×4×3×2×1 =120

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The wording is extremely awkward. It should ask something like "how many different sequences can be made out of..."

Marta Reece - 3 years ago

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Thanks. I've updated the problem statement.

In the future, if you have concerns about a problem's wording/clarity/etc., you can report the problem. See how here .

Brilliant Mathematics Staff - 3 years ago

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I do that when there is no solution to attach a comment to, and will do so in the future, following your suggestion. However, some people do get very upset about being reported. Some have even retaliated by reporting my problems for some imaginary offenses, such as the fact that the problem was worded in English.

Marta Reece - 3 years ago

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@Marta Reece – Thank you for your feedback. I am also aware of which problems you're referring to. We will look into it, we also believed that the report system could be improved on.

Brilliant Mathematics Staff - 3 years ago

0 pending reports

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