Yasin

Integers a,b,c,d and e satisfy 50<a<b<c<e and a,b,c,d,e from a geometric sequence what is the sum of all possible distinct values of a?

Astronomers determine masses of distant objects by observing their smaller companions. For example, they can measure the period of a planet orbiting around a distant star, measure the radius of its circular orbit, and then employ Newtonian physics to dete...