a1 = 10
an = -20
r = 3
an = a1 + (n-1)*r
an = a1 + (-3n) + 3
an = a1 - 3n + 3
-20 = 10 - 3n + 3
3n = 10 + 20 + 3
3n =33
n =33/3
n = 11
QSL?
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Verified answer
a1 = 10
an = -20
r = 3
an = a1 + (n-1)*r
an = a1 + (-3n) + 3
an = a1 - 3n + 3
-20 = 10 - 3n + 3
3n = 10 + 20 + 3
3n =33
n =33/3
n = 11
QSL?