I'm here again, and now with more doubts on algebra on probability functions;
$Let$ $\Omega{{a1, a2, a3}}, $find $ P(a1) $whether: $P(a1) = 2*P(a2) $ and $ P(a3) = \dfrac{1}{4}$
I've got now after notice that $P(a1) + P(a2) + P(a3) = 1$ that $P(a1) + 2*P(a2) = \dfrac{3}{4}$ but I've got stuck on this;
what I do now ? Thanks in advance.