How many test cases are necessary to cover all the possible sequences

How many test cases are necessary to cover all the possible sequences of statements (paths) for
the following program fragment? Assume that the two conditions are independent of each other : –

…………

if (Condition 1) 
 
 then statement 1 
 
 else statement 2 
 
 fi
 
 if (Condition 2) 
 
 then statement 3 
 
 fi
 
 

…………

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