Question 29An “unfair” coin has a $\frac23$ probability of turning up heads. If this coin is tossed $50$ times, what is the probability that the total number of heads is even?$2^5\left(\frac23\right)^{50}$$\frac12\left(1-\frac1{3^{50}}\right)$$\frac12$$\frac12\left(1+\frac1{3^{50}}\right)$$\frac23$