1. Let p, q,r be the propositions p: Grizzly bears have not been seen in the area. q: Hiking is safe on the trail. r: Berries are ripe along the trail. Write these propositions using p, q,r and...

Extracted text: 1. Let p, q,r be the propositions p: Grizzly bears have not been seen in the area. q: Hiking is safe on the trail. r: Berries are ripe along the trail. Write these propositions using p, q,r and logical connectives. a) Berries are ripe along the trail, but grizzly bears have not been seen in the area. b) For hiking on the trail to be safe, it is necessary but not sufficient that berries not be ripe along the trail and for grizzly bears not to have been seen in the area.