$$a_n = frac1(n + 1)!$$
$$a_n = frac(-1)^nnn! + 1$$
What go the exclamation note mean, and how carry out I go about this in different way with the exclamation mark?
You are watching: What does an exclamation point mean in math
The factorial the a number is represented by the exclamation point (!).The factorial that a number $x$ is often described as the product of all hopeful integers much less then or equal to $x$. For example:
$$4! = 4cdot3cdot2cdot1 = 24$$
It is often additionally useful to describe $x!$ in a recursive relation:
$$x! = x(x-1)!$$
where $0! = 1$.
This technique is often great because that helps explain why $0!=1$ (see likewise the "empty product" for more on this). Using the above explanation, we may find $4!$:
$$4! = 4(3)! = 4(3)(2)! = cdots = 4(3)(2)(1)(0)! = 4(3)(2)(1)(1) = 24$$
edited Apr 9 "12 at 1:29
answered Apr 9 "12 in ~ 0:09
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If the number is 4! climate you count under so it would be $4 imes 3 imes 2 imes 1= 24$. One more thing is that if the number is 7! you would certainly count down till you acquire to two. So it would certainly be $7 imes 6 imes 5 imes 3 imes 2 =5040$ 7 x 6 x 5 x 4 x 3 x 2 I simply put in the 4 the was not provided although the answer is still 5040.
edited Apr 27 "16 at 2:46
answered may 19 "14 at 23:03
Hockeylover It's actually defined recursively and one "counts down" come $0! :=1$. $endgroup$
jan 7 "15 at 20:55
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