Subtraction and multiplication in modular arithmetic — task. Mathematics State Board, Class 10.

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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.)

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