4 @ 9 # 3 = 1 and 4 @ 8 # 4 = 2
the no. we are getting is small so, minus and divide sign should be there
consider # = div
        @ = minus
$$4 - 9\div 3$$ = 1
1=Â 1
similary
$$4 - 8\div 4$$ = 2
2=2
similary do with 5 @ 6 # 2Â
$$5 - 6\div 2$$ = 2
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