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If 1172 \(\equiv\) 2 \((mod \ 26)\) and 555 \(\equiv\) 9 \((mod \ 26)\), then find the subtraction and multiplication in modular arithmetic.
1. 617 \(\equiv\) \((mod \ 26)\)
2. \(\equiv\) 18 \((mod \ 26)\)
(Note: Insert a negative sign wherever necessary.)
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