However, the number chosen at random was close to a number Feynman happened to know was an exact cube, allowing him to use approximate methods.
haʊˈɛvɚ, ðə nˈʌmbɚ tʃˈoʊzən æt ɹˈændəm wʌz klˈoʊs tʊ ɐ nˈʌmbɚ fˈeɪnmən hˈæpənd tə nˈoʊ wʌz ɐn ɛɡzˈækt kjˈuːb, ɐlˈaʊɪŋ hˌɪm tə jˈuːz ɐpɹˈɑːksɪmət mˈɛθədz.