Answer
a. 256
b. 32
c. 64
Work Step by Step
a. There are 8 places to choose 0 or 1, so the answe r is $2^8$=256
b. There are 5 places to choose 0 or 1 (the first three places are already chosen), so the answer is $2^5=32$.
c. There are 6 places to choose $0$ or $1$, so the answer is $2^6=64$.
