PDF chapter test TRY NOW
If 1065 \(\equiv\) 1 \((mod \ 28)\) and 820 \(\equiv\) 8 \((mod \ 28)\), then find the subtraction and multiplication in modular arithmetic.
1. 245 \(\equiv\) \((mod \ 28)\)
2. \(\equiv\) 8 \((mod \ 28)\)
(Note: Insert a negative sign wherever necessary.)
