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without a means to communicate with players through some in game option there is no real swift communication for pings or warnings. you could stop to type stuff out but its slow.
a jungler with a well coordinated team can make plays happen.
if 2 people are duo q they probably on some chat program so working together to 2v1 someone is probably very easy for them. tho if the other team's top and jungler were duo also chatting I would put my money on them.