1 + (1+2) + (1 + 2 + 3) + ------ + n তম পদ পর্যন্ত = ?
A
16 n (n+1)(2n+1)
B
12n (n+1)(n+2)
C
16n (n+1)(n+2)
D
16n (n +1) (n +2) (n +3)
Correct Answer: 16n (n+1)(n+2)
