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In the interconnection of ideal sources shown in the figure, it is known that the $60 \mathrm{~V}$ source is absorbing power.

Which of the following can be the value of the current source $I$?

1. $10 \mathrm{~A}$
2. $13 \mathrm{~A}$
3. $15 \mathrm{~A}$
4. $18 \mathrm{~A}$