Prove the following conjecture using a direct proof:

Prove the following conjecture using a direct proof:

$((2a|))$

Disprove the following conjecture:

Write an indirect proof $($by contrapositive$)$ to prove the following conjecture:

$(AAm,$ninZ$)((282mn)((7m)vv(2n)))$

Write an indirect proof $($by contradiction$)$ to prove the following conjecture:

$)=(2(mod6))=(-4b(mod6)$