The Sultan of Delhi who has been described by historians as the `mixture of opposites` is Muhammad Bin Tughlaq. Muhammad Bin Tughlaq was the Sultan of Delhi from 1325 to 1351. He was known for his contradictory policies and actions during his reign. On one hand, he was known for his intelligence, education, and military skills. However, on the other hand, he made several disastrous decisions that resulted in political instability and economic hardships. One of his most famous decisions was the unsuccessful attempt to shift the capital city from Delhi to Daulatabad, which led to widespread chaos and suffering. His reign is considered as a time of contradictions and the term `mixture of opposites` is fitting to describe his rule. Therefore, option 3, Muhammad Bin Tughlaq, is the correct answer.