(1) rs = –1. No info on t ; insuff
(2) rt = –1. No infoon s; insuff
Combining r^2st=1 i.e; rst=1/r; no idea if r=-1 . So insufficient. E
(2) rt = –1. No infoon s; insuff
Combining r^2st=1 i.e; rst=1/r; no idea if r=-1 . So insufficient. E


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