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Home » e y\) (to avoid division by zero in the original expression). - Crankk.io

e y\) (to avoid division by zero in the original expression). - Crankk.io

📅 February 27, 2026 👤 scraface

Feb 27, 2026

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📌 Solution: Let $ H $ be the number of heads in 6 flips of a fair coin, so $ H \sim \text{Binomial}(6, \frac{1}{2}) $. Let $ D $ be the outcome of a fair 6-sided die, uniformly distributed over $ \{1,2,3,4,5,6\} $. We seek $ P(H = D) $.

📌 Since $ D $ takes integer values from 1 to 6, we only consider values of $ H = k $ for $ k = 1,2,3,4,5,6 $. But $ H $ max is 6, so all values are possible.

📌 Because $ D $ and $ H $ are independent:

📌 P(H = D) = \sum_{k=1}^{6} P(H = k) \cdot P(D = k) = \sum_{k=1}^{6} \binom{6}{k} \left(\frac{1}{2}\right)^6 \cdot \frac{1}{6}.

📌 Factor out constants:

📌 P = \frac{1}{6 \cdot 2^6} \sum_{k=1}^{6} \binom{6}{k} = \frac{1}{384} \left( \sum_{k=0}^{6} \binom{6}{k} - \binom{6}{0} \right) = \frac{1}{384} (2^6 - 1) = \frac{63}{384}.

📌 \frac{63}{384} = \frac{21}{128}.

📌 Thus, the probability that the number of heads equals the die roll is $ \boxed{\dfrac{21}{128}} $.

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