1. Lia ite menten of thene sin. a) |s | a is a roal mumbe mast duat \( x^{2}=1 \) ! b) (s) a is a posative incour les thas 12) c) (x \{x is the iquase of ab integor and \( x<100 \) ) d) \{s I x is an inirger wecb dat \( \mathrm{x}^{2}=1 \) !
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