187.From a group of 15 cricket players, 11 players are to be selected. In how many ways can the team be selected if the captain and the vice captain must be included?
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188.How many different products can be obtained by multiplying two or more of the numbers 1, 2, 3, 9 without repetition?
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189.In how many ways can 4 books be selected out of 10?
(a) In how many of these selections, two particular books are always selected?
(b) In how many of these two books are always excluded?