C-13-Q038mediumsingle_mcqWhich term of the series 8+11+14+17+⋯8 + 11 + 14 + 17 + \cdots8+11+14+17+⋯ is 392392392?a129129129thb130130130thc131131131std128128128thব্যাখ্যাWith a=8a = 8a=8, d=3d = 3d=3, the nnn-th term is 3n+53n + 53n+5; setting 3n+5=3923n + 5 = 3923n+5=392 gives 3n=3873n = 3873n=387, so n=129n = 129n=129.