Need all solved $1.$ With S$\_1=\{2,3,5,7\},$ S$\_2=\{2,4,5,8,9\}$ and U$=\{1$: $10\}$ compute S$\_1\backslash$cup S$\_2.(3$pts$)2.$ With S$\_1=\{2,3,5,7\},$ S$\_2=\{2,4,5,8,9\},$ compute S$\_1\backslash$times S$\_2$ and S$\_2\backslash$times S$\_1(4$pts$)3.$ Use the proof by contradiction to show that S$\_1=$S$\_2$ if and only if $($S$\_1\backslash$cap S$\_2)\backslash$cup $($S$\_1\backslash$cap S$\_2)=(10$ p t s$)$