The number of people who have both is 50.
Given that,
- There are 100 people out of which 70 have the DVD player, 60 have the CD player and 20 have neither.
Based on the above information, the calculation is as follows:
= 70 + 60 - (100 - 20)
= 130 - 80
= 50
Therefore we can conclude that the number of people who have both is 50.
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