dax filtering

Hello, 

please can someone help me understand why these two filters produce slightly different results (I would have thought they are doing the same job but I am obviously misunderstanding something)?

filter 1 =
CALCULATE (
    COUNT ( table2[id] ),
    table2[gender] >= 1
        && table2[gender] <= 3
        && table2[zone] >= 5
        && table2[zone] <= 8
)

filter 2 =
CALCULATE (
    COUNT ( table2[id] ),
    table2[gender] >= 1
        && table2[gender] <= 3
        && table2[zone] == 5
        || table2[zone] == 6
        || table2[zone] == 7
        || table2[zone] == 8
)

Thanks,

A