I)Probability that the book moved from A to B is Chemistry=\frac{1}{8}.
II)Probability that the boom taken from B is Chemistry=\frac{1}{6}.
P=\frac{1}{8}*\frac{1}{6}=\frac{1}{48}.
C
II)Probability that the boom taken from B is Chemistry=\frac{1}{6}.
P=\frac{1}{8}*\frac{1}{6}=\frac{1}{48}.
C