In an experiment with bar pendulum having four holes, the same time period is recorded when it is suspended at distances `21cm,

In an experiment with bar pendulum having four holes, the same time period is recorded when it is suspended at distances `21cm, 24cm, 40cm` nad `52cm` respectively form one end. The length of bar pendulum is
A. `84 cm`
B. `72 cm`
C. `64 cm`
D. `60 cm`

In an experiment with bar pendulum having four holes, the same time period is recorded when it is suspended at distances `21cm, 24cm, 40cm` nad `52cm`

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