If 4 people wish to have confidential communication with each other using symmetric encryption, they will need at least _____

If 4 people wish to have confidential communication with each other using symmetric encryption, they will need at least _____ different keys. If 4 people wish to have confidential communication with each other using asymmetric encryption, they will need at least _____ different keys (a public/private key pair counts as two keys).

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