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(a) An experiment involves 30 participants. From these, a group of 5 participants is to be tested under a special condition. How many groups of

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(a) An experiment involves 30 participants. From these, a group of 5 participants is to be tested under a special condition. How many groups of 5 participants are possible? (b) From a collection of 51 store customers, 2 are to be chosen to receive a special gift. How many groups of 2 customers are possible

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