On a ranch, a rancher can place a loop of rope, called a lasso, once in every 2 throws around a cow’s neck. What is the probability that the rancher will be able to place a lasso around a cow’s neck at least once in 6 attempts?  Choose the most appropriate option
A) 3 / 4 B) 7 / 8 C) 15 / 16 D) 31 / 32 E) 63 / 64

Rationale: "p ( missing all 6 ) = ( 1 / 2 ) ^ 6 = 1 / 64 p ( success on at least one attempt ) = 1 - 1 / 64 = 63 / 64 the answer is e ."
Answer: E