Which is equivalent to the sum of 2 + 4 + 6 + ... + 2(n+1) Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.

a n(n-1)/2

b n(n+1)/2

c (n+1)(n+2)/2

d n(n-1)

e n(n+1)

f (n+1)(n+2)

g 2n(n-1)

h 2n(n+1)

i 2(n+1)(n+2)