What’s an explicit formula of 7,21,63,189,567

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?