Find S. (1) S^4=S! (2) !=1

Question

Find S.

(1) S^4=S!
(2)  !=1

 :stupid2

ian7777 · Answer

A. 

in the first one, S must equal 1.

In the second one, S could be 0 or 1.

stolyar · Answer

In the second one S can be -1

gayathri · Answer

I agree with Ian, A. I did not think about -1 too :roll:

But do you have factorial for negative numbers. I thought it was only for positive numbers

stolyar · Answer

I don't have factorials for negative numbers. It works for 0 too.

Praetorian · Answer

welcome back, stolyar

stolyar · Answer

Exams are over. The last one was marketing. :wave

I need to drop by more often--still want to write about Michigan.

MA · Answer

excellent problem.

gayathri · Answer

From 1, S cannot be 0 as 0! is always 1 but 0^4 is 0.

MA · Answer

yes, i agree with you. therefore, i edited my reply. i thought 0 to the power is 1. thanks gayathri.

ian7777 · Answer

you're right...didn't think about that one. that only makes it less reliable. Still A.

Prep Toolkit