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


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

$I n h o w m a n y w a y s c a n y o u s e l e c t 4$ $f r o m 40 p e r s o n s i f e v e r y t w o p e r s o n s$ $m a y b e s e l e c t e d t o g e t h e r a t m o s t o n e$ $t i m e ?$
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