AP ICET 18 Sep 2021 Shift 1 Paper

Question Numbers : (61 to 65)
In a certain code. the letters of the English alphabet $\mathit{A},\mathit{B},\mathit{C},.......\mathit{Z}$ are given numbers $1,2,3$,$......,26$ respectively. Then letter is coded as letter, where $1\le \mathit{r}\le 26$ and $1∕\mathit{n}\mathrm{}\equiv \mathit{r}\left(\mathrm{mod}26\right)$(that is 26 divides $1∕\mathit{n}-\mathit{r}$ ). For example letter $\mathit{I}$ is coded as , since $99\mathrm{}\equiv 21$ (mod 26). For decoding reverse process is used. Based on this, answer questions 61 to 65 .