If Sn=n^2+5 than t10 is equal to:
a)20
b)21
c)19
d)10
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when n=1 , a =6
when n=2, 2a+d =9
d = -3
t(10) = a +9d
= 6 -27 = -21
when n=2, 2a+d =9
d = -3
t(10) = a +9d
= 6 -27 = -21
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