Cant understand the base case

Please describe how start<=end will act as the base case of this code

Hello @ANIKET_DALAL,

It is not the base condition.
The base condition is when start>end i.e. the else part of the condition start<=end.
For start>end, we have to just return from the function.

But, as it is the else part, so we need not to specify it.

Hope, this would help.
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