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Anonymous
so 3n2 = 15 ie n2 = 5 so n = sqrt 5
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t(n) = 3n2 + n = n(3n + 1)
(3n+2)(n+1)
-24
n= sqrt 225 = 15
n + 26 = 41 n = 41 - 26 n = 15 Thanks