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Die waarskynlikheid dat ‘n sekere deur gesluit is, is 0.6. Die sleutel vir die d...

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Die waarskynlikheid dat ‘n sekere deur gesluit is, is 0.6. Die sleutel vir die deur is een van vyf ongeïdentifiseerde sleutels op ‘n sleutelhouer. U kies ewekansig twee sleutels van die sleutelhouer voor u die deur nader. Die waarskynlikheid dat u die deur kan oopmaak sonder om vir nog sleutel terug te gaan is / The probability that a certain door is locked is 0.6. The key to the door is one of five unidentified keys hanging on a key chain. You randomly select two keys from the key holder before approaching the door. The probability that you can open the door without returning for another key is

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