Period of a pendulum of length l1 - l2 from the periods of lengths l1 and l2

1. A.
   $T_1 - T_2$
2. B.
   $T_1 T_2$
3. C.
   $\sqrt{T_1^2 - T_2^2}$
4. D.
   $\frac{T_2}{T_1}$

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1. A.
   $\sqrt{T_1^2 + T_2^2}$
2. B.
   $\sqrt{T_1^2 - T_2^2}$
3. C.
   $T_1 + T_2$
4. D.
   $T_1 - T_2$

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1. A.
   $1.2$ s
2. B.
   $1.4$ s
3. C.
   $1.6$ s
4. D.
   $1.8$ s

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