In a poll conducted among 180 active investors, it was found that 100 use discount brokers, 122 use full-service brokers, and 54 use both discount and full-service brokers. How many investors use only discount brokers?
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I realy see a problem here
100 use discount brokers
122 use ful service
and 54 use both, so
100-54 = 46 and answer is C
but then only full service brokers use
and 68+46+54=168. I can't get, where 12 more people are lost from 180
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