Let a_n be n^ th term of the series 5 + 8 + 14 + 23 + 35 + 50 + ......... and S_n= _ k=1 ^na_k. Then S_ 30 -a_ 40 is equal to

JEE Main 2023 Mathematics question

Let be term of the series 5 + 8 + 14 + 23 + 35 + 50 + ......... and . Then is equal to

Answer: (C)

Question ID VK-035606