R. S. Aggarwal Solutions for Chapter: Coding-Decoding, Exercise 9: Exercise

In a certain code language, 'pen pencil' is written as $\text{'}\$\pounds \text{'}$, 'eraser sharpener' is written as $\text{'}@\#\text{'}$ and 'pencil eraser' is written as $\text{'}\$@\text{'}.$ Then, what is the code for 'pen'?

In a certain code,$\text{'}786\text{'}$ means 'study very hard', $\text{'}958\text{'}$means 'hard work pays' and $\text{'}645\text{'}$ means 'study and work'. Which of the following is the code for 'very'?

In a certain code language, '$123$' means 'hot filtered coffee'. ' $356$' means 'very hot day' and ' $589$' means 'day and night'. Which digit stands for 'very'?

In a certain code language '234' means 'spark and fire', '456' means 'spark is cause' and '258' means 'fire is effect'. Which of the following numerals used for 'cause'?

In a certain code ‘$253$’ means ‘books are old’; '$546$' means ‘man is old’, and ‘$378$’ means ‘buy good books’. What stands for ‘are’ in that code?

In a certain code, '$467$' means 'leaves are green', '$485$' means 'green is good' and '$639$' means 'they are playing'. Which digit stands for 'leaves' in that code?

In a certain code language, '$134$' means 'good and tasty', '$478$' means 'see good pictures' and '$729$' means 'pictures are faint'. Which of the following digits stands for 'see'?

In a certain code language, '$3\mathrm{a}, 2\mathrm{b}, 7\mathrm{c}$' means 'truth is eternal', '$7\mathrm{c}, 9\mathrm{a}, 8\mathrm{b}, 3\mathrm{a}$' means 'enmity is not eternal' and '$4\mathrm{d}, 2\mathrm{b}, 8\mathrm{b}$' means 'truth does not'. Which of the following means 'enmity' in that language?