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 V1
V1 = 1- ⇒
In second attempt it removes of the air remaining.
That means they remove = of air.
So, V2 = - ⇒
After third attempt V3 = of air will be remaining.
So, the series will be look like
The above series is NOT looking like A.P.
∵ Their common difference is not same.
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