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Which of the below is an invalid outcome when 3 coins are tossed?

Which of the below is an invalid outcome when 3 coins are tossed? Correct Answer TTTT

A coin has two sides i.e. head (H) and tail (T). When a coin is tossed, we can get either head or tail. When 3 coins are tossed, the possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT. Option TTTT is possible only when 4 coins are tossed.

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