A bag contains 4 black counters and n white counters. Two counters are taken from the bag at random without replacement. The probability of 2 white counters is 1/12 Which of the following equations must be solved to find the value of n? a) 2n2 – 2n – 5 = 0 b) 11п? — 23п -30 — 0 c) 11n? – 19n – 12 = 0 d) 19n? – 20n – 12 = 0 d) c) b) a) OOOO

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