<prompt> Bala kakaretso ea letoto lena: 510152025nan  <response>: Instruction in English: Calculate the sum of this series: 510152025 . Response in English: The sum of the series is calculated as follows: 51015202575So, the sum of the given series is 75. . Response in Sesotho: Kakaretso ea letoto lena e baloa ka tsela e latelang: 51015202575 Kahoo, kakaretso ea letoto le fanoeng ke 75. 