If `t_n` denotes the nth term of the series `2+3+6+11+18+...t h e nt_(50)` `49^2-1` b. `49^2` c. `50^2+1` d. `49^2+2`

If t_n denotes the nth term of the series 2+3+6+11+18+….. Then t_50 is

Find the 50th term of the series 2+3+6+11+18+… .

Find the sum of the following series whose n t h term is: 2n^3+3n^2-1.

a^(2)-49b^(2)

Let t_(n) denotes the n^(th) term of the infinite series (1)/(1!)+(10)/(2!)+(21)/(3!)+(34)/(4!)+(49)/(5!)+......... Then,lim_(n rarr oo)t_(n) is

The additive inverse of S, where S =1 - 2 + 3 -4 + 5 -6 + 7 - 8 + ...+ 49 - 50 is