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Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 171223 by mr W last updated on 07/Sep/22

In how many ways can you select 4 from 40 persons if every two persons may be selected together at most one time?

$${In}\:{how}\:{many}\:{ways}\:{can}\:{you}\:{select}\:\mathrm{4} \\ $$$${from}\:\mathrm{40}\:{persons}\:{if}\:{every}\:{two}\:{persons} \\ $$$${may}\:{be}\:{selected}\:{together}\:{at}\:{most}\:{one}\: \\ $$$${time}? \\ $$

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