1. Seven bands have volunteered to perform at a benefit concert, but there is only enough time for four of the bands to play. How many lineups are possible? Is this combination

2. An election ballot asks voters to select three city commissioners from a group of six candidates. In how many ways can this be done?is this permutation

3. To win the small county lottery, one must correctly select 3 numbers from 30 numbers. The order of the selection is made does not matter. How many different selections are possible? is this combination

4. The company Sea Esta has ten members on its board of directors. In how many different ways can it elect a president, vice-president, secretary and treasurer? is this permutation