Consider the following argument. It was raining yesterday but this afternoon the weather is gloomy. If we go for a picnic in Port Dickson, it means the weather is bright with sunlight. If we do not go for a picnic in Port Dickson, then we will take a walk at a nearby park. We will take a walk at a nearby park only if we are home before Maghrib prayer. a. Write the argument in symbolic form. b. Establish the validity of the argument (using inference rule and/or laws of logic) and determine the conclusion of the above argument.