C-13-Q116mediumsingle_mcqThe sum 12+24+48+⋯+76812 + 24 + 48 + \cdots + 76812+24+48+⋯+768 is —a152415241524b150015001500c129612961296d10241024ব্যাখ্যাHere a=12a=12a=12, r=2r=2r=2, and the last term 768=12⋅26768=12\cdot 2^{6}768=12⋅2 gives . So .