Practice problem
Find the sum of the series 15+252+153+254+155+256+⋯\frac15 + \frac2{5^2} + \frac1{5^3} + \frac2{5^4} + \frac1{5^5} + \frac2{5^6} + \cdots51+522+531+542+551+562+⋯.
Type a concept, like “slope” or “photosynthesis”.