This number is defined as the set containing the empty set, under the Peano
This number is defined as the set containing the empty set, under the Peano axioms. If you randomly place 12 distinct letters in 12 distinct envelopes, you expect this many letters to end up in the correct envelope on average. This is the number of dwarf planets always found inside the orbit of Neptune. A molecule of propanone contains this number of oxygen atoms, and a single molecule of chlorophyll contains this number of transition metal atoms. Male ants have this many sex chromosomes, as does any gamete. This many neutrons are found in deuterium. For 10 points, how many sides does a MÃ¶bius strip have?
This number is defined as the set containing the empty set, under the Peano axioms.
one