Circle whether the number of objects in each set is odd or even. https://talkandcomment.com/p/921ffa80c9a5b30103613592 (voice note)
https://talkandcomment.com/p/b29930960c653548764f777e (voice note)
https://talkandcomment.com/p/a8420af98ccf603fbbd62703 (voice note)