He was an engineer, as his father before him. Thus, it was no surprise when in 1923 Bruno de Finetti enrolled at Milan Polytechnic. There, however, he discovered his true passion for mathematics and in particular, as he wrote to his mother in a letter reported by Carla Rossi, a former student of his, he realized that:
Siya ay isang engineer, tulad ng kanyang ama bago siya. Kaya, ito ay walang sorpresa kapag sa 1923 Bruno de Finetti-enroll sa Milan politeknik. May, gayunman, natuklasan niya ang kanyang tunay na simbuyo ng damdamin para sa matematika at sa partikular, bilang wrote siya sa kanyang ina sa isang titik na iniulat ng Carla Rossi, isang dating mag-aaral ng kanyang, siya na maisasakatuparan na: