how to swap two numbers with out using temp variable

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how to swap two numbers with out using temp variable..

a=1
b=2
a=a+(b-a)
b=(a+b)-b

Is This Answer Correct ?

12 Yes

16 No

how to swap two numbers with out using temp variable..

Answer / kusum

if (a>b)
temp=a;
a=b;
b=temp;

Is This Answer Correct ?

0 Yes

21 No

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