Q1 please

Question 1 (1 point) N 1. (1 mark) Given in N(N+1) (2N41) then the value of the series 6 _ (() (21 -1)) + 1) is given by: a) N'(N + 1) +6N b) 2N(N + 1) + 6N c) N(N + 1)(N + 2) + 6N d) N(N - 1) + 6N e) N(N + 1) (2N + 1) + 6N