Raymond B. answered • 10/31/22
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5
(2)
Math, microeconomics or criminal justice
S5=(5)(5+1)/2= 15
Sn= n(n+1)/2
Gauss' formula 1st used to sum 1 through 100
= 1+2+...+n
Delaun M.
asked • 10/31/22Math question about !
So 5! Is 5*4*3*2*1=120 but what is the equation for 5+4+3+2+1=15
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