Unfair coin tossed twice [closed]

An unfair coin is tossed twice. The probability of heads is 3 times the probability of tails. What is the probability that at least one head is flipped?

closed as off-topic by user223391, wythagoras, Simon S, Dilip Sarwate, ronnoJul 2 '15 at 8:35

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1 Answer

If I'm interpreting your question correctly, if the probability of heads is three times the probability of tails, then we have $P(\text{heads}) = 3/4$ and $P(\text{tails}) = 1/4$.

Because the probability of getting no heads is $1/4 \cdot 1/4 = 1/16$, the probability of getting at least one head is $15/16$.

• yap its right answer thnx – iftikhar ali Jul 2 '15 at 20:19