In 16 experiments studying the electrical behavior of single cells, 12 use micro-electrodes made of metal and

Question:

In 16 experiments studying the electrical behavior of single cells, 12 use micro-electrodes made of metal and the other 4 use micro-electrodes made from glass tubing. If 2 of the experiments are to be terminated for financial reasons, and they are selected at random, what are the probabilities that

(a) neither uses micro-electrodes made from glass tubing?

(b) only one uses micro-electrodes made from glass tubing?

(c) both use micro-electrodes made from glass tubing?

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