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Two coins $R$ and $S$ are tossed. The $4$ joint events $H_{R}H_{S}, T_{R}T_{S}, H_{R}T_{S}, T_{R}H_{S}$ have probabilities $0.28, 0.18, 0.30, 0.24$, respectively, where $H$ represents head and $T$ represents tail. Which one of the following is TRUE?

  1. The coin tosses are independent.
  2. R is fair, S is not.
  3. S is fair, R is not.
  4. The coin tosses are dependent.
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