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A simple pendulum of length l1 has frequ...

A simple pendulum of length `l_1` has frequency `1/4 Hz` and another simple pendulum of length `l_2` has frquency `1/3 Hz`. Then time period of pendulum of length `(l_1 + l_2)` is

A

`5 s`

B

`1 s`

C

`sqrt (7) s`

D

`sqrt (12) s`

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