C-13-Q031mediumsingle_mcqThe nnn-th term of 5+8+11+14+⋯5 + 8 + 11 + 14 + \cdots5+8+11+14+⋯ is —a3n−13n - 13n−1b3n+53n + 53n+5c3n+23n + 23n+2d5n+35n + 35n+3ব্যাখ্যাHere a=5a = 5a=5 and d=3d = 3d=3, so an=5+(n−1)⋅3=5+3n−3=3n+2a_n = 5 + (n-1)\cdot 3 = 5 + 3n - 3 = 3n + 2an=5+(n−1)⋅3=5+3n−3=3n+2.