javascript - simple delete two out four in a array -

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hi have quiz multiple answer want when button pressed delete 2 out off 4 leaving 2 answers 1 correct , 1 false.

var questions = [     ["what 10 + 4?", "12", "14", "16", "b"],     ["what 20 - 9?", "7", "13", "11", "c"],     ["what 7 x 3?", "21", "24", "25", "a"],     ["what 8 / 2?", "10", "2", "4", "c"] ];

thank .





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