621, 265, 492, 622
3, 9, 11, 13

ossz = 2000

p(g1) = 621/2000
p(g2) = 265/2000
p(g3) = 492/2000
p(g4) = 622/2000

p(j|g1) = 97/100
p(j|g2) = 91/100
p(j|g3) = 89/100
p(j|g4) = 87/100

p(g1|j) = (p(g1) * p(j|g1)) / (sumN(p(gN) * p(j|gN)))

p(g1|j) = (621/2000 * 97/100) / (621/2000 * 97/100 + 265/2000 * 91/100 + 492/2000 * 89/100 + 622/2000 * 87/100) =
        = 621 * 97 / 621 * 97 + 265 * 91 + 492 * 89 + 622 * 87 =
        = 60237 / 182254