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which types of investments should be choosen for 401k at early 20's?
If you don't want to pay much attention to your investments, target date funds -- assuming you find one (like Vanguard's) with no management fees beyond those acquired from the underlying funds -- are usually a great choice: when the target date is far off, they invest almost entirely (usually 90% or so) in (mutual funds that in turn consist of many) stocks, with the remainder in bonds; as the date gets closer, the mix is automatically shifted to more bonds and less stocks (i.e. less risk, but less potential return too).