The probability that $x_1, x_2, x_3$ are in an arithmetic progression, is (A) $\frac{9}{105}$ (B) $\frac{10}{105}$ (C) $\frac{11}{105}$ (D) $\frac{7}{105}$
The probability that $x_1, x_2, x_3$ are in an arithmetic progression, is\\
(A) $\frac{9}{105}$\\
(B) $\frac{10}{105}$\\
(C) $\frac{11}{105}$\\
(D) $\frac{7}{105}$