Question $3$: USE CRT for decryption $(45$ points$)$

a$)$ Use RSA to encrypt and then decrypt, $($using CRT for decryption$),M=80,$ use $p=11,q=19,$ Use $e=7$

b$)$ Use RSA to encrypt and then decrypt, $($using CRT for decryption$),M=40,$ use $p=13,q=19,$ use $e=13$

c$)$ Use RSA to encrypt and then decrypt, $($using CRT for decryption$),M=50,$ use $p=13,q=29,$ use $e=11$