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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.)