Statements: All books are diaries. Some diaries are pens. Some pens are drawers. All drawers are chairs.

Conclusions:

I. Some drawers are diaries.

II. Some chairs are pens.

III. Some pens are books.

IV. Some diaries are books.

Statements: All suns are stars. All moons are stars. Some planets are suns. Some stars are gases.

Conclusions:

I. Some stars are planets.

II. Some suns are gases.

III. No moon is a planet.

IV. Some gases are moons.

Statements: Some robots aremachines. Some computers are both robots andmachines. Some animal are machines. Some toys are animals.

Conclusions:

I. Some toys are robots.

II. Some toys are machines.

III. Some animals are computers.

IV.Some robots are not toys.

How many such sevens are there in the given series each of which is immediately preceded by 9 and also immediately followed by 8?

How many such odd numbers are there in the given series each of which is immediately preceded by an even number?

How many such even numbers are there in the given series each of which is immediately followed by an even number?