Please,,,,?? Bantuin aku dulu yha,,, Besok lghy udah dikumpul

c) (3 . 1 + 2) + (3 . 2 + 2) + ... + (3 . 6 + 2)
d) (-1)^1 + (-1)^2 + (-1)^3 + (-1)^4 + (-1)^5
e) 0 + (1 . 3)/2 + (2 . 4)/2 + (3 . 5)/2 + (4 .6)/2