Answer :

Let V be the initial volume of air that is present in the cylinder.

They have said that a vacuum removes of the air.

Let initial volume (v) = 1 litre

After first removal of air, the remaining will be V_{1}

V_{1} = 1- ⇒

Similarly,

In second attempt it removes of the air remaining.

That means they remove = of air.

So, V_{2} = - ⇒

After third attempt V_{3} = of air will be remaining.

So, the series will be look like

1, ,

The above series is NOT looking like A.P.

∵ Their common difference is not same.

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