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If a container contains 't' units of a particular liquid. Out of which 's' units are taken out and replaced by water. Then after p−1p-1 operations, the quantity of pure liquid left in the container is given by:-

Solution

✅ Correct Option: 3

Each replacement leaves the fraction (1−st)\left(1-\dfrac{s}{t}\right) of whatever pure liquid was present. Applying this factor p−1p-1 times to the initial quantity tt gives t(1−st)p−1t\left(1-\dfrac{s}{t}\right)^{p-1} units.

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