Multiplication Rule, Circular Table Arrangement and Probability

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1) In how many ways can you guess an answer in a 10-item True of False question?
a. 2048
b. 1024
c. 512
d. 256

2) How many ways can you arrange three Science books (Biology, Chemistry, Physics) in any order on a shelf?
a. 24
b. 18
c. 12
d. 6

3) Rica has 7 red T-shirts and 5 green T-shirts. If she picks one T-shirt at random, what is the probability that it will not be green?
a. 1/2
b. 1/6
c. 5/12
d. 7/12

4) How many ways can seven people be seated at a round table?
a. 5040
b. 840
c. 720
d. 120

5) The face of a coin is either head or tail. If there are three coins tossed, what is the probability of getting three tails or three heads?
a. 1/4
b. 1/8
c. 3/8
d. 3/4