Answer
Probability of being all heads = $\frac{1}{64}$
Work Step by Step
When a coin is tossed,
Total outcomes = 2
Favorable outcomes to get heads = 1
Probability of getting heads = $\frac{1}{2}$
When a coin is tossed six times, probability of being all heads = $\frac{1}{2}\times\frac{1}{2}\times\frac{1}{2}\times\frac{1}{2}\times\frac{1}{2}\times\frac{1}{2}$ = $\frac{1}{64}$
