Answer:
Step-by-step explanation:
We have [tex]55 = 5 x 11[/tex]
23 x 36 mod 5 = 3 (since unit digit is 8)
23x36 mod 11 =3
Since 5 and 11 are prime we get
23x36 mod 55 = 3 mod 55
--------------------------------------------------
b) 91 = 13 x7
[tex]29x51 mod 7 = 2\\29x51 mod 13 = 10\\[/tex]
29x51 mod 91 =23