The major drawback of RAD model is __________.

Statements: 

Only a few School are Station.

Only a few Stations are Hospital.

All Station are Police.

Conclusions:

I.Some refill may be pen.

II.All pen being glitter is a Possibility.

Statement:

All Mathematics are Economics

Only a few Mathematics are Chemistry

No Chemistry is Physics

Conclusion:

Statements:

Only buses are cars

Only a few buses are trains

No train is a bike

Conclusions:

Statement : No fruit is a vegetable.

Some vegetable are petals.

All petals are trees.

Some trees are leaves.

Statements:

Only Orange are Kiwi.

Some Oranges are Cherries.

Only a few Papaya is Cherry.

Conclusions:

Statement:

Only Earth is Sun

Some Earth is Moon

Conclusion:

I. All Earth are Moon is a possibility

Statement:

At-most some Black are White.

Only a few Pink are Black.

Some Pinks are White.

No Pinks are Red.

Statement:

Each dog is cat.   

Only a few cats are tigers.

Some tigers are zebras.      

Conclusion:      

Statements:

Some wire are cable.

Some cable are hub.

Only hub is switch.

Some board are hub.

Conclusions: