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A cell of emf E and internal resistance ...

A cell of emf E and internal resistance r is connected to two external resistance `R_(1) " and " R_(2)` and a perfect ammeter. The current in the circuit is measured in four different situations :
(i) without any external resistance in the circuit
(ii) with resistance `R_(1)` only
(iii) with `R_(1) " and " R_(2)` in series combination
(iv) with `R_(1) " and " R_(2)` in parallel combination
The currents measured in the four cases are 0.42A, 1.05 A, 1.4 A and 4.2 A, but not necessarily in that order. Identify the currents corresponding to the four cases mentioned above.

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