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The probability is 0, since there will be some 3-tosses in which you get 0, 1 or 3 heads. So not all 3-tosses will give 2 heads.
Green is a mixture of yellow and blue, if you mix all the primary colours together you will get brown. This would be the same if used green instead of just yellow.
3 to 1
3/4 The only way a tail doesn't show up is if all heads come up. P(all heads) = (1/2)*(1/2)=1/4 P(at least one tail)=1-P(all heads)=1-(1/4)=3/4
red yellow and blue