an is given by O 10 If the n' partial sum of 1 . an = (n + 2) (n+ 1) n=1 3n + 4 2 Sn = O 2. an n + 2 (n + 2) (n+ 1) what is an when n > 2? O 10 3. an = n(n + 2) O 2 4. an = n(n + 2) 10 5 . an = (n+ 2) (n + 3) O 2 6. an = (n+ 2) (n + 3)