(1+1/n)^(3*n)
((1 + 1)/n)^(3*n)
(1 + 1/n)^(3*n)
3*n / 1\ lim |1 + 1*-| n->oo\ n/
Limit((1 + 1/n)^(3*n), n, oo, dir='-')
3 e