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Valida õige valem, mis tagastab "Korras", kui lahtris B6 olev täht on a, b või c; ja "Viga!" vastasel juhul.
=IF(AND(B6<>"a";B6<>"b";B6<>"c");"Viga!";"Korras")
=IF(OR(B6=a;B6=b;B6=c);"Korras";"Viga!")
=IF(OR(B6="a";"b";"c");"Korras";"Viga!")
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