User blog comment:PrinceVinc/Y U NO SAY MIA/SS??? by DuffTime/@comment-70.74.208.217-20121006135119/@comment-109.217.243.143-20121006214208

imo the wards NEEDED are at the number of 4:

1 ward at purple wraith

1 ward on the  entrance behind blue ( close to mid where you can go to wolf/ tower  or rive)

1 ward at nashor a bit higher

1 ward at drake a bit lower

there the jungler of purple team CANNOT  leave his jungle or enter yours without you seeing him

2 other wards can be needed in the second bush of top and bot to stop ninja ganks

the mid should place the one  at purple wraith  , top or jungler at nash

support the 2 others

it costs 75 g per solo laner and 150 to sup

and you can't be ganked without tp or oracle ( that's why pro teams usually go oracle real early on junglers, because you can't gank if properly warded