In $1^{\text {st }}$ case, Carnot engine operates between temperatures 300 K and 100 K. In $2^{\text {nd }}$ case, as shown in the figure, a combination of two engines is used. The efficiency of this combination (in $2^{\text {nd }}$ case) will be :
Select the correct option:
A
same as the 1st case
B
always greater then the 1st case
C
always less than the 1st case
D
may increase or decrease with respect to the 1st case
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