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If a fair coin is tossed $5$ times and comes up heads four times out of five. Then if the coin is tossed a sixth time under the same conditions, the probability of it turning up heads is:

1. $80\%$
2. $125\%$
3. $50\%$
4. $20\%$

Coin being fair and events being independent, when the coin is tossed a sixth time, probability of head is 50%.
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