C-13-Q035mediumsingle_mcqThe nnn-th term of 4+7+10+13+⋯4 + 7 + 10 + 13 + \cdots4+7+10+13+⋯ is —a3n+13n + 13n+1b3n−13n - 13n−1c3n+43n + 43n+4d4n+34n + 34n+3ব্যাখ্যাHere a=4a = 4a=4 and d=3d = 3d=3, so an=4+(n−1)⋅3=4+3n−3=3n+1a_n = 4 + (n-1)\cdot 3 = 4 + 3n - 3 = 3n + 1an=4+(n−1)⋅3=4+3n−3=3n+1.