The inclusion/ exclusion idea can actually be useful for harder project euler questions (deriving some sort of closed form sum to compute). Worthwhile to think

The inclusion/ exclusion idea can actually be useful for harder project euler questions (deriving some sort of closed form sum to compute). Worthwhile to think about. Im also reminded about the "semigroup resonance" way to solve fizzbuzz posted recently on hn [0]. Seems like another interesting method. [0] https://blog.ploeh.dk/2019/12/30/semigroup-resonance-fizzbuzz/ https://blog.ploeh.dk/2019/12/30/semigroup-resonance-fizzbuz...