Four numbers are chosen at random (without replacement) from the set {1, 2, 3, ..., 20}. Statement-1 The probability that the chosen numbers, when arranged in some order will form an AP is- 1 85 Statement-2 If the four chosen number form an AP, then the set of all possible values of common difference is (1, 12, 13, 14, 5}. [AIEEE 2010, 8M] (a) Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1 (b) Statement-1 is true, Statement-2 is false (c) Statement-1 is false, Statement-2 is true (d) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1