At about what number of companies does the reduction in risk from adding stocks of more companies to a portfolio do little to reduce risk?

Name: At about what number of companies does the reduction in risk from adding stocks of more companies to a portfolio do little to reduce risk?
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The Answer of At about what number of companies does the reduction in risk from adding stocks of more companies to a portfolio do little to reduce risk?

At About What Number of Companies Does the Reduction in Risk