a¹ = 5, r = -1 n = 10
sn= a¹ ( 1 -r ń)
_________
1-r
s10 = (5) (-1) 10
s10= -50
s=± (-50) ¹-10
answer
sn= a¹ ( 1 -r ń)
_________
1-r
s10 = (5) (-1) 10
s10= -50
s=± (-50) ¹-10
answer
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