hard · GMAT Quant
A research laboratory monitors 150 cultures for three specific genetic markers: Alpha, Beta, and Gamma. 95 cultures possess the Alpha marker, 80 possess the Beta marker, and 75 possess the Gamma marker. Exactly 45 cultures possess both Alpha and Beta, exactly 35 possess both Beta and Gamma, and exactly 40 possess both Alpha and Gamma.
If 25 cultures possess all three markers, how many cultures possess the Beta marker ONLY?
- 25
- 0
- 55
- 35
- 15
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