Mathematics, 30.03.2021 14:00 Yuii

Seven bulbs of which four are defective are to be tried in two holders in a dark room. The number of trials the room shall be lighted is
(a) 18
(b) 15
(c) 28 (d) 6

Answers: 2

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Seven bulbs of which four are defective are to be tried in two holders in a dark room. The number o...