Problem 25 Compute the weakest precondition for each of the selection constructs and their postconditions: а. if (a == b) b = 2 * a + 1 b. if (x < y) else X = x + 1 с. if (x > y) b = 2 * a else y = 2 * x + 1 {b > 1} X = 3 * else {x < 0} y = 3 * x - 1 if B then S1 else S2 {y > 3} {B and P}S1 {Q}, {{not B)and P}S2 {Q} {P}if B then S1 else S2 {Q}

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