Question: (a) A fair coin is tossed until a head is obtained. What is the probability that the number of tosses required is an odd number?

(a) A fair coin is tossed until a head is obtained. What is the probability that the number of tosses required is an odd number?

(b) A fair die is thrown seven times. Find the probability that the outcome contains one '1', two '2', three '3', but no '4'?

I would like to know how to calculate these questions, thanks!

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