Consider the following statements pertaining to a pile group and a single pile at failure :
1. In loose and medium dense sands, the failure load per pile in a group will generally be greater than the failure load for a single pile.
2. In cohesive soils, the failure load per pile in a group will be greater than failure load for a single pile.
3. For piles driven in dense sands, the failure load per pile in a group is greater than the failure load for a single pile.
4. When the pile spacing is greater than 10 times the pile diameter, the failure loads per pile in a group and forly same in both sands and clays.
Of these statements :