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P315 K&B puzzle

 
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Hi, This is from Page 315 K&B book. How to solve this kind of questions ?

Place the fragments into the code to produce the output 33. Note, you must use each fragment exactly once.
class Incr {
public static void main(String[] args) {
Integer x = 7;
int y = 2;
x ___ ___;
___ ___ ___;
___ ___ ___;
___ ___ ___;
System.out.println(x);
}
}

FRAGMENTS:

Answer:
class Incr {
public static void main(String[] args) {
Integer x = 7;
int y = 2;
x *= x;
y *= y;
y *= y;
x -= y;
System.out.println(x);
}
}

 
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UseCodeTags not Quote tags. And it can be solved by simple arithmetic. just multiplication and subtraction.
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