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# The temperatures of two bodies measured by a thermometer are $t_1 = 20\: \: ^{\circ}C \pm 0.5 ^{\circ}C$ and $t_2 = 50\: \: ^{\circ}C \pm 0.5\: \: ^{\circ}C$. Calculate the temperature difference and the error theirin.

$30^{\circ}C \pm 1^{\circ}C$