Asked by Me
Let a, b and c integers. Prove or disprove the next statements:
a.7|š^7āš
b.If 7|š2+š2 then 7|š and 7|š
c.If 7|š3+š3+š3 then 7|ššš
a.7|š^7āš
b.If 7|š2+š2 then 7|š and 7|š
c.If 7|š3+š3+š3 then 7|ššš