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Suppose in a microarray experiment, there are 140 genes under consideration, and only 90 genes out...

Suppose in a microarray experiment, there are 140 genes under consideration, and only 90 genes out of the 140 genes are expressed. Let X be the number of expressed genes out of six randomly genes.

Is this a binomial or Hypergeometric distribution?

Find the probability that only three of the six genes selected will be expressed.

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